Montessori geometry cards come in three sets. The first set is solid, filled in shapes. The second shows shapes with thick outlines. The third shows shapes with thin, fine outlines. These shapes match the shapes in the Montessori geometric cabinet.
These cards are designed to help children understand that an abstraction of a design can indicate a concept as well as the literal appearance of the design. For example, all three circle figures indicate the circle inset in the geometry cabinet even though they do not all look identical. For the purposes of this example, we will use the circle cards and the circle drawer. However, all the shapes in the geometry cabinet will work in the same fashion with corresponding geometry cards.