The sensorial materials and activities at the Toddler and Primary level are iconic Montessori. They allow children to pursue their natural tendency to classify sensorial impressions and sort by size, shape, color, touch, sound, and weight. The sensorial materials isolate specific qualities, have a built in control of error, allow for repetition, and make abstract qualities concrete. Sensorial activities lay a foundation for math, geometry, geography, botany, art, and music.