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- Sep 2021
Ancient peoples frequently engaged in offloading their mental contents and augmenting their brainpower with external resources, as evidenced by objects they left behind. Sumerians employed clay tokens to keep track of livestock and other goods when trading; Incas tied knots in long cords, called quipus, to memorialize events; administrators and merchants across a broad swath of the ancient world used abacuses and counting boards.
Interesting to see these examples of mnemonic devices referenced here.
One could certainly add standing stones, stone circles, etc. to the list.