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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.
Objects exist even if we do not see them. A new phenomenon for the young child. We call this the peek-a-boo effect, and children enjoy this and learn a great deal from it.