"That is why it is so hard to imagine the visual experience of our prehistoric ancestors, or, for that matter, the girls of nineteenth-century Malawi, who lived in a world without right angles. Inhabitants of, say, late Neolithic Orkney would only have seen a handful of perpendicular lines a day: tools, shaped stones, perhaps some simple geometric decoration on a pot. For the most part, their world was curved: circular buildings, round tombs, stone circles, rounded clay vessels."
What has rectilinearity done to our minds?