Birth & up. Observe shapes and colors with this 8-piece set of Perception Cubes! These cubes measure 1.25" and are made of durable acrylic, making them ideal for all ages. The cubes can be used on a light table to observe color mixing. When cubes are held at an angle, many squares and rectangles appear inside for fascinating visual effects! The colorful sensory cubes make great additions to sensory stations and quiet corners. The tough acrylic also makes them ideal for water play. The cubes are easy to clean with warm, soapy water. Cubes include 8 colors: purple, pink, blue, green, red, yellow, orange and clear.