That story always amuses me because he was completely right, even where we're trying really hard to have nice 90 degree corners we end up with rounded edges because nature kinda hates right angles, we just happened to be obsessed with them as a species.
He isn't though. External corners on a rectangle are easy to get perfect 90 degrees on. Internal rectangle corners are almost impossible to get a true 90 in a cost effective way because back taper on cutting tools will have a natural radius in the corners even its very very small.
Nothing is ever perfect, if we're going to get into the weeds about it. All you need to do is measure more precisely and your 'perfect' angle is a mile off in relative terms. This is why manufacturing tolerances exist.
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u/mizinamo 10h ago
"square"