To get to the Munduruku, Pica had to wait for some locals to take him to their territory by canoe.
"How long did you wait?" I inquired.
"I waited quite a lot. But don't ask me how many days."
"So, was it a couple of days?" I suggested tentatively. A few seconds passed as he furrowed his brow: "It was about two weeks."
The more I pushed Pica for facts and figures, the more reluctant he was to provide them. "When I come back from Amazonia, I lose sense of time and sense of number, and perhaps sense of space." This inability to give me quantitative data was part of his culture shock. He had spent so long with people who can barely count that he had lost the ability to describe the world in terms of numbers.
The rest of the article describes at length how people understand numbers cross-culturally.
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