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Montessori materials are NOT toys, but educational materials. Proper use requires appropriate training.
Montessori materials may contain small, rough, sharp, or other elements that could cause injury or damage if used improperly.
It may therefore only be used by children under the supervision of appropriately trained persons and in an appropriate environment.
Paula Polk Lillard and Lynn Lillard Jessen. The authors provide parental guidance for the establishment of an environment to aid in the development of focus and concentration.