Cognitive Set Theory was not intended to be complicated, but enough details were included in the book that I sometimes feel that the main points were thereby obscured.
So, I have written a short book about a cup, called “Cup: Reflected”. It’s about 30 sentences, and has 10 pictures. It serves as an introduction to the concepts of “perceptual references” and “conceptual references” through the use of mirrors and maps.
Take a look at the 4×6 PDF here: https://cognitivesettheory.com/files/CupReflected.pdf