>In a lecture about the universal characteristics of classical architecture, professor Nathaniel Walker argued that human beings crave two things: order and variety. If there's too much order, it's boring and oppressive. If there's too much variety, it's chaotic and unpleasant. In his view, classical architecture all over the world aims at creating a "delicate balance between order and variety."

It's how 'fractal' things are. There is at least one 3b1b video about this. I think humans prefer a fractal number of about 1.5 or so, which is about what nature is.