This is a children’s board book. I believe the pages are all white with black font writing. This is an interactive pull tab book where, to start, you drop an actual red and yellow sided counter disc into the book. Each page changes the color of the disc going from red to yellow. I am not sure if the red/yellow color is necessary as perhaps other color counters may have been used? It may have been about shapes. I suspect it may have been a 1980’s or 1990’s book. You can pull tabs, slide, flip and open pages to reveal the counter. It was my son’s favorite book for years. We cannot find it and he mentioned it to me the other day. I would like to find it for his 14th birthday if I can. Thank you.