Birth & up. Your child can observe the wonders of light as they look through the Perception Spheres! Children can discover how light behaves and see the world from a different and distorted angle in various colors. The spheres are smooth, pleasing, and sized just right for little hands to hold. Ideal for babies sensory play or older children can look through the spheres to observe the world around them. Includes eight perception spheres in different translucent colors. Spheres measure 2" in diameter.