Good educational book
This is a pretty good book on shapes. What I like about these Spectrum books is that they are very focused on one subject, unlike other activity books, which typically focus on more different things. These give the child many different activities about the same thing, in this case shapes. There are a lot of different activities to reinforce your child on shapes. The color illustrations are good. It is not a gigantic book, but because it is so focused it is very effective at helping your child gain mastery of shapes. I would recommend it.