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Just last week I was looking up ADHD and autism in blind people, but I was also questioning whether blind people could have aphantasia. Or rather, how does blind people perceive roundness or a circle in their mind? They know what it feels like at least, so is it tied to some other sense? I’m guessing blind people have a way of mapping out surroundings and 3D space, but I imagine explaining how a person thinks about stuff like this is as hard to describe as whether two people perceive the same colours the same way.
Might be Helen Keller, very famous deafblind activist. A quote from wikipedia kind of shows how hard communicating when senses are limited: