“…When I come back from Amazonia I lose sense of time and sense of number, and perhaps sense of space,” he said. He forgets appointments. He is disoriented by simple directions. ” I have extreme difficulty adjusting to Paris again, with its angles and straight lines”… He had spent so long with people, the Munduruku [an indigenous amazonian tribe], who can barely count [and barely have any straight lines or angles in the forest they inhabit] that he lost the ability to describe the world in terms of numbers…”

quote from Alex Bellos, “Here’s looking at Euclid”, 2010, cpt.0, [with my own remarks]