Obviously you don't want to consider the concept that it's about how we're wired in the brain... which is what the post was about... and the discussion of shapes described how I got to the concept!!
There are other cues that cause us to react, (you know, cues that create feelings in us,) both visual, such as facial hair, aural cues, olfactory cues. The things that help us recognize whom we're interfacing with. They cause reactions in the brain and thus feelings about our place in relation to the person we're in contact with.