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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. Montessori theory and practice, with special emphasis on the child's elementary school years. For parents, teachers, and all those who are concerned about education today.