This is super interesting but hurting my brain.
A person in 3D can see 3D, 2D and 1D. But a person in 2D can only see 1D.
How can a person living in 2D world see 2D things like Circles.
What we (3D beings) see is a 2D projection of the world around us, 2D beings would indeed see a 1D projection of their 2D world (e.g. we only really see a circle when looking at a sphere). Just as we use depth perception to differentiate 3D objects from 2D ones, 2D beings would also be able to discern a circle from a line in a 2D world.
