My computer was down for a couple days. Burned out ports.
Henchbrother Ping for the sis.
Looks like something of interest for you.
Somehow, I doubt that this "language" has been lost, but it may well be hidden.
I visited Peru a few years back. Lots of fascinating experiences, but one in particular. Up on the altiplano, we were walking past this tower. Stone, round, tapered towards the top, and with windows only at the very top.
I looked around. There were two more towers visible; the three formed a straight line. After walking around this funny structure, I realised what it was. Spoke to the (native) guide:
"This is a heliograph tower"
He smiled and nodded.
"But the Inca are supposed to have no writing. How could they use a heliograph?"
He smiled again, but his smile was that of a man with a secret.
An absurd statement, considering that other than a counting system, no abstract ideas or administrative or religious thoughts or events have ever been deciphered. None.
Zero.
So, this overreaching PC statement is based exactly on what?
Well, of course. They had to keep the books on the marching-powder trade.
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We don't know whether the quipus contain language at all. They may just contain numbers, for example, or functioned as a complicated sort of rosary.
I doubt they will ever be deciphered. Only a handful of them exist, and there's nothing to relate any of them to whatever they might have represented.