Are there any theories about why it took us so long to create a written or at least pictographic type of language, considering that as far as we can tell we have had pretty much the same quality of brain for tens of thousands of years? It seems to be natural for us to want to leave behind some sort of account of what we, or our leaders have done, or the life we lead, for others to see, cave paintings and tattoos for example. Is it thought that we simply haven't discovered any earlier examples so just don't know, or are there positive theories to explain the great amount of time it took even though our mental capabilities appear to have been adequate?
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