Here is my son, eight-and-a-half months old, playing with his copy of the Baby's Book of Computer Science!
I finally had a chance to sew his together. Hooray! He enjoys playing with washclothes, just by rolling around with one in his hands, admiring it, so he has a similar kind of interaction here. I'm hoping all those colorful flaps will be fun for him to practice his pincer grip on in the coming months.