These unique child-size glasses and interchangeable lenses let students observe the world while learning about color. Learning Resources Primary Science Color Mixing Glasses feature 8 easy-to-change lenses-2 each of red, yellow and blue and distortion lenses that let you see the world like a bug. These Primary Science® glasses teach primary colors as well as mixing to make secondary colors by combining up to 2 lenses per side. Get additional instruction and kaleidoscopic fun when you use the lenses on their own.