Thanks for sharing that Klüver form constant, did not know about that term.
The Tetris Effect I had heard about.
The ability of our minds and brains to create these forms by themselves and also there being a logical, game like mechanic when you use our software might explain parts of why it feels so good to continue doing, and why these acts permeate into the mind even not when doing it.
Also the fact that you can easily spend hours working on these patterns, when you have a tool that enables that easily enough, it supports the thinking that our minds start to replicate and predict these patterns, as mentioned by one poster above this.
https://en.wikipedia.org/wiki/Form_constant