Montessori believed that the learning environment is as important as the learning itself. Effective learning takes place in a structured environment. A well-prepared environment should include tables, chairs, shelves, cupboards and should be large enough to accommodate the children's height and needs (week 3, study notes, page 24). She also believes that disabled, hearing impaired and mentally retarded children also need a special environment for their special education. Materials are very important in the Montessori method, which is why she created a set of materials. The materials of this set are: a set of wood, it can be cylinders and blocks. Ten pink blocks of graduated size, ten red rods and ten brown wooden prisms, fabrics and boards of different textures, weights and colors, wooden puzzles, various geometric shapes glued to cards, wooden boards with lines musical staff, musical bells and wooden discs. . All of this material contributes to children's sensory development (Week 3, Study Notes, page