1.This product is designed with three colors, red, yellow, and green and designed as animals to help hold an infant's attention. 2. The building block pieces are designed in three basic shapes - triangle, circle, and square. 3. While playing, an infant will need to test, think and master the corresponding relationship between the holes and the external threads of the post to set the hollow building block piece on the pillar. This greatly assists development of hand-eye coordination, and logical thinking.