This is a very fun book I learned to make in a Book Arts Class in 1994 at the University of the Arts in Philadelphia. I’m sorry I don’t know the instructors name as she was quite wonderful.
The book can be viewed in two ways. If you open the book in a normal fashion, each page consists of 3 separate cards but each page turns as expected. This can be seen in the third image. If, instead, the covers are pulled apart, the cards flip to create a single image, in this case a color wheel. The fourth image is a close up of the image, (the covers would extend to the left and right).

Standing Color Books

Lying Flat, (opened normally and covers pulled apart)

This is a variation on an accordion book as the cards are attached to an accordion structure, with the top and bottom cards going in one direction and those in the middle going the other. I was teaching Color Theory at the time so that became the topic of my book.