EXPLORE THROUGH COLOR — Explore colors and shapes with this set of 21 colorful shapes. The set features 7 different colors (3 shapes per color). Each shape features a 3 mm hole at the top for hanging. A HANDS-ON LEARNING RESOURCE — Use these educational toys for hands-on teaching of color and regular vs. irregular shapes. LIGHT IT UP! — Watch these manipulatives spring to life in front of a sunlit window or a light panel. Create colorful, eccentric shadows. DECORATE YOUR SPACE — Use the small hole in each shape to hang these colorful shapes in front of windows.