This is the basic book about different shapes. It allows the child to feel them as well.
Sourc: Barnes and Noble.

This colorful board book teaches children about shapes and texture. It gives a shape word and portrays several objects that fit that shape, such as a basketball for a circle. One of each of those examples has something tactile about it, like the rectangle pillow that is "silky" and contains a scrap of silk (or polyester) for the reader to touch. The illustrations are actually photographs, so the concepts should be fairly easy for little ones to understand. For ages 0-3.