The Rapa Nui and the Indus Valley Civilization are found 20,000km apart, the former on an isolated island in the Pacific Ocean (Easter Island), and latter in modern day Pakistan.

As far as we know, the two communities are also separated in time by at least 2,000+ years, with no known "Rosetta Stones" to decipher to scripts.

Is it really a coincidence?

enter image description here (https://iaoj.files.wordpress.com/2016/09/indus-script.png?w=474)

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    I'd be willing to bet that diagram is bogus. – John Dee Sep 29 '18 at 0:19
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    ok, aside from the bit that it was bogus, what is the likelihood that, if you cross-match an extensive amount of primitive symbol-based scripts, and then line up the symbols that do match within 2 scripts that you would NOT have any similarities, between any subset of symbols and 2 scripts? Again, these are pretty basic concepts: "guy hunting", "dead guy", etc. And there's not even the requirement to match meaning. Then say 10 artists from tribe 1 and 10 from tribe2, pick best matches. Ignore all non-matches. One should not infer too much deep meaning even this whole thing wasn't bogus. – Italian Philosopher Sep 29 '18 at 0:58
  • Clearly, travelers from Easter Island must have crossed the oceans thousands of years ago and colonized Pakistan. Sadly, they left behind their giant-stone-statue-staring-out-to-sea technology, and thus caused their descendants in Pakistan to miss out on a really great gig selling fake stone heads to tourists. The moral of the story: always consider the marketing tie-ins! Believe it or not! – Bob Jarvis Sep 30 '18 at 3:00

The supposed relationship between rongorongo (the Rapa Nui script) and the Indus Valley script was proposed in a 1932 article by the Hungarian engineer Vilmos Hevesy (Guillaume de Hevesy).

I'm not sure where the picture in the question is from, but many of the symbols shown do look very similar to those in de Hevesy's article:

de Hevesy's symbol comparison

At the time, there were very few accessible rongorongo texts for comparison, so it was not immediately apparent that several of the rongorongo glyphs illustrated in Hevesy's publications had been modified and the supposed relationships were, in fact, spurious.

Dr. Alfred Métraux was the first to highlight the problem in a 1938 article published in the review Anthropos. The demolition of de Hevesy's theory is detailed and brutal. In the article, Métraux observed that:

In order to stress the likeness between two signs, Mr Hevezy has too often changed the proportions between the respective elements of the signs.

However, there was no suggestion that de Hevesy had perpetrated a deliberate fraud, or that his 1932 paper had been a hoax. Rather, the most vitriolic comments in Métraux's paper were reserved for those who had uncritically accepted de Hevesy's 1932 theory.

Dr Métraux sent a copy of the article, with a dedication to Sr J. Imbelloni, of the Argentine Museum of National History. Sr Imbelloni, writing in the Journal of the Polynesian Society, commented on the matter as follows:

... most of the analogies exist only in Hevesy's reproductions, whereas they disappear when compared with those of the original series, “this gentleman, moved by his enthusiasm, having slightly modified the original symbols, and accentuated similitudes which otherwise might perhaps never have suggested themselves.”

The quote is, presumably, from the dedication. So, over-enthusiasm from de Hevesy, but a failure to properly peer-review his work by Métraux's fellow professionals.

Although there are some similarities between some symbols in the two scripts, these are relatively few in number. On the other hand, there are significant differences differences between them - not least in the direction of writing. As Dr. Métraux observed in his 1938 article:

No unbiased man who studies the tablets and the Indus script can fail to notice the enormous difference, not only in the system, but in the form and type of the signs.

If you are interested, the full story is described in Rongorongo: The Easter Island Script : History, Traditions, Texts by Steven R. Fischer, (pp147-153).

To date, the rongorongo script remains undeciphered, but the work of Thomas Barthel in the 1950s (notably, his 1958 book Grundlagen zur Entzifferung der Osterinselschrift), has catalogued the Rongorongo corpus. On the basis of that catalogue, Dr Barthel argued that Rongorongo was not a development unique to Easter Island, but was part of an original Polynesian heritage.

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    While the theory could have been sensational, I suspect that Hinducentric works are responsible for most of its spread. That raises the question, then, of how sensational it was, and how broadly the original "hoax" spread. The original hoax is the most historical part of this answer... not saying that's a bad thing. – John Dee Sep 29 '18 at 4:02
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    @JohnDee I think it is unfair to characterise de Hevesy's work as a 'hoax'. He was certainly over-enthusiastic in looking for parallels between the scripts, but probably not much more than that. The theory certainly spread around the world. It was one of the catalysts for further research into the rongorongo script. Unfortunately, despite the fact that the theory was comprehensively demolished by Dr. Métraux, it keeps re-appearing - often (but by no means always) on sites which also reference ancient aliens & the Illuminati! – sempaiscuba Sep 29 '18 at 10:00
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    The other thing is pictographic glyphs aren't exactly random; they are meant to represent real-world things which a person might want to record. The odds of two unrelated pictographic writing systems both having stick-figure representations of a person as glyphs have to be nearly 100%. – T.E.D. Sep 29 '18 at 14:23
  • @T.E.D. Yep. And that reductionist pattern we recognise in those anthroponorphic sticks that are similar. The more abstract ones diverge in total. Unfortunately many tables showcasing our phoenician alphabet also only display a subset, establishing the short excerpt sample 'tradition' like in the OP, despite less than 30 glyphs being necessary for total comparison. Even that seems too long for most. – LangLangC Sep 30 '18 at 10:20

It should be now regarded as a legitimately researched line of possible inquiry that turned out to be completely bogus based on spurious correlational observations.

An early enthusiast for this observation was Albert Étienne Jean-Baptiste Terrien de Lacouperie who noted in 1894 in his book

"Beginnings of writing in central and eastern Asia, or, Notes on 450 embryo-writings and scripts":

A closer comparison with plates i. to viii. of the Elements of South Indian Palceography soon showed me that I was on the right track. And a further study of the Vaihu characters and their analysis by comparing the small differences (vocalic notation) existing between several of them, convinced me that they are nothing else than a decayed form of the above writing of Southern India returning to the hieroglyphical stage. With this clue, the inscriptions of Easter Island are no more a sealed text. They can easily be read after a little training. Their language is Polynesian, and I can say that the vocabulary of the Samoan dialect has proved very useful to me for the purpose.
It is useless to dwell on the importance of this little paleographical discovery for the history of civilization, and its dissemination eastwards.

Unfortunately, this guru has kept much of his secrets. No further evidence for this claim appears, but it is equally easy to read the slightly esoteric "everything's connected" theme as a hint.

Q: What's the explanation for the similarities seen between the Rapa Nui script and the Indus Valley Script? … Is it really a coincidence?

No, it is not even a coincidence. While some glyphs, as presented above, may seem similar, looking at the originals tells quite a different story. The number of glyphs that have some resemblance from each scripts is indeed quite low altogether.

The two systems are apart in space, time, culture, language, history, you name it. There is not much connection to be found at all, except that both were developed by human beings and compared by Western scholars. Some of those researchers may have been quite motivated to see something. So much so that when this was first reported they distorted the sparse evidence that was available. A tendency that apparently survived outside of academia.

This is a funny story since sites like "ancient wisdom" still inspire great confidence to the notion that there is a very mystical connection (Easter Island - Indus Valley Scripts). As it is discussed frequently (Quora: How can you explain the similarities between the writings found on Easter Island and the ones found in the Indus Valley (two places 20,000 km away)?) some look at the scholarly debate seems to be instructive.

In the first half of the 20th century a heated debate ensued; examples:

Guillaume de Hevesy: "The Easter Island and the Indus Valley Scripts. (Ad a critical study Mr. Métraux's)", Anthropos, Bd. 33, H. 5./6. (Sep. - Dec., 1938), pp. 808-814:

Thus, I think, enough proofs have been furnished of the biassed spirit and moreover of the levity with which Métraux has dealt here with a scientific matter. As to several other statements of his, no less inaccurate then those I have mentioned his stricture on the above, including Cuna-Script, I rely upon the authority of Prof. von Heine-Geldern (whose superb study of the Easter Island script happily appears in this same number of the "Anthros" determine whether there is substantial of nor them. I leave pos"), to any Likewise, it to the readers of these lines to decide whether a prejudiced attitude may be a sufficient excuse for the way in which Métraux has worked - or not worked.
In any case they will agree that one cannot take very seriously the meddling in science of a person, who, like Métraux, employ such slipshod, frivolous and methods for his studies as I have when the prevaricating shown, especially authority particularly refers, Hunter, regard to whom he viz. declares with that he has read it "with and when another work, disgust"; moreover, to his bound to say that this is the most reckless defamation of a scholar I ever came across." Therefore to take any further notice of Métraux's assertions would be beneath my dignity. I have however felt it was right to this much attention to his "critical study" not only because of his association with such a world famous scientific institutions the Yale but further to Prof. von his statements": I feel authority, Heine-Geldern writes concerning University; put on their guard any future scholars whose honour might be flippantly attacked from this quarter.

You might notice the lack of content in the above that is compensated by a certain level of vitriol despite being published in a supposedly reputable journal?

This idea was early on diagnosed as incapable of holding too much water:

H. Heras: "The Easter Island Script And The Script Of Mohenjo Daro", Annals of the Bhandarkar Oriental Research Institute, Vol. 19, No. 2 (1938), pp. 122-126:

Considering therefore these discrepancies between the two vocabularies as well as the doubtful antiquity of the tablets themselves, it seems beyond doubt that the scripts of Mohenjo Darò and of the Easter Island are not related between each other in any way, and that therefore the similarity existing between the signs of these two scripts is merely coincidental. This is also the final conclusion arrived at, on different grounds indeed, by Möns. Henri Lavacheri who recently undertook an expedition to the Easter Island to verify the statements of, and to study the problems exposed, by Möns, de Hévesy.

But it is of course a limited subset that is presented in the original question. A subset selected to specifically foster pattern recognition in a human mind. Looking at it

Richard E. McDorman: "Universal Iconography in Writing Systems Evidence and Explanation in the Easter Island and Indus Valley Scripts":

It has been noted that graphically similar symbols have been employed to represent semantically cognate ideas in a number of early, unrelated writing systems. One explanation for this phenomenon is that there exist universal iconographic principles that bear upon the minds of those creating these scripts, thereby influencing the graphical form of the glyphs that comprise the newly created writing systems. The principle of universal iconography as applied to writing systems implies that certain pictorial representative forms tend to be associated with semantically similar ideas irrespective of cultural or societal factors. A result of this principle is that many early logographic writing systems possess structurally similar signs, often representing semantically related referents.

Although the fifty or so characters shared by the two writing systems may be the product of some degree of randomness, at least in terms of the particular forms selected from the universal icon set by the creators of each script, that a few dozen signs appear in the scripts of both the Indus Valley and Easter Island is not coincidence, which implies accidental correspondence with no causal factor. Because both the Easter Island and Indus Valley scripts make at least moderate use of the principle of pictography, the variety of forms exhibited by the symbols in their character inventories is heavily constrained. As a result of this and other factors constraining the graphical forms of the characters that compose the two scripts, between forty and fifty similarly formed glyphs appear in both writing systems. When one considers that the Indus script is comprised of some 500 characters and that the rongorongo of Easter Island number into the thousands, and that the formation of their characters follows a discrete number of definable principles, that the two scripts have in common a few dozen characters is not remarkable.

From Heras some counterexamples for the picture in the question:

enter image description here (click)

Note that the picture in the question seems to compare symbols looking alike. Does it compare symbols that represent also meaning alike? Some more pictures to compare:

enter image description here enter image description here Source, Flenley & Bahn (2003), see below

Another take on Easter Island symbols:

enter image description here (Wikipedia: Rongorongo)

A sample of Indus valley glyphs

enter image description here Asko Parpola: "Deciphering the Indus script", Cambridge University Press: Cambridge, New York, 1994, p 74.

Why was Hevesy from the first quote so angry at Metreaux?

enter image description here enter image description here from: Alfred Métraux: "The Proto-Indian Script and the Easter Island Tablets. (A critical study)", Anthropos, Bd. 33, H. 1./2. (Jan. - Apr., 1938), pp. 218-239.

Trying to get to the root of some development is not a hoax. Proposing a stylised version of a symbol is a legitimate approach to the problem. Not being transparent about deliberate changes however is quite unscientific.

How old is that script that supposedly developed in isolation?

The obvious conclusion is that the ‘script’ was a very late phenomenon, directly inspired by the visit of the Spanish under González in 1770, when a written proclamation of annexation was offered to the chiefs and priests for them to ‘rubriquen en forma de sus caracteres’ (sign by a mark in the form of their characters). Was this their first experience of speech embodied in parallel lines? The document survives, and the marks placed on it (ill. 52) are pretty nondescript except for a vulva, and a classic bird motif on the right which is identical to rock art images and similar to characters on the tablets.

Whatever its origin, the Rongorongo phenomenon now survives only as markings on 25 pieces of wood scattered around the world’s museums. Some signs also survive on paper in makeshift ‘books’ from the end of the nineteenth and early twentieth centuries, but these were considered by the islanders to be an ‘inferior form of script’. The 25 wooden objects contain over 14,000 ‘glyphs’, including one incised staff (which probably represents the original Rongorongo artefacts; the driftwood boards are likely to have been elaborated later on the model of the staffs). They were probably originally called kouhau ta, or ‘written staffs’; another name, Kohau motu mo rongorongo, is a recent invention, translated by Sebastian Englert as ‘the lines of inscriptions for recitation’. This is often shortened to kouhau rongorongo (‘wooden board for recitation’),15 which Métraux believed to mean ‘chanter’s staff’ and hence to indicate a link with Mangareva and the Marquesas where staves were used to beat the rhythm of chants.
The term Rongorongo (chants, recitations) did not exist in Rapanui before the 1870s, and was certainly brought from Mangareva by people who returned after abandoning the Catholic mission there: in Mangareva the Rongorongo was a class of high-ranking experts charged with the memory and recitation of sacred marae chants; it is therefore highly likely that the concept came to Rapa Nui with its first settlers, and the same may well be true of the ‘script’.
All the surviving Rapa Nui pieces are over 125 years old: many look quite unused, and besides, some are fragments of wood foreign to the island, and even include a European oar. It is therefore probable that they all postdate European contact. Although a myth has arisen that the Peruvian slave raids of 1862 removed the last islanders who could truly understand the tablets— knowledge of them was confined to the royal family, chiefs, and priests, and every person in authority was carried off to Peru—this is actually not true. Many of the older people seem to have avoided the raid, but most if not all of them later succumbed to the smallpox and virulent pneumonia brought back by one of the few survivors.

[…] If Fischer is correct, then we now know what most of the inscriptions say, even though we cannot read them yet. But there appears to be a marked preoccupation with fertility, which fits with the phenomenon’s late date. Be that as it may, and whether or not the islanders developed their ‘script’ alone or under outside influence, it remains a crowning glory of this unique culture, one of the most highly evolved Neolithic societies in human history.

John Flenley & Paul Bahn: "The Enigmas of Easter Island. Island on the Edge", Oxford University Press: Oxford, New York, 2003, p173–190.

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