Sensorial

"The  Sensorial  Materials are  deceptively simple in appearance and totally satisfying to the developing child.
Given the opportunity, with or without specialized materials, children will sort things by size, shape, color, touch, sound, temperature and weight. They will grade from dark to light, and from large to small."

The Montessori sensorial apparatus allows them to classify sensorial impressions in an organized, orderly and scientific manner.