The Geometric Cabinet introduces the plane geometric shapes to the child. This cabinet contains six drawers of flat wooden insets portraying different types of:
- irregular four-sided and curved figures
Each inset has a little knob by which the child can move it in and out of its wooden frame.
Initially, the 3 year old uses the shapes as if they were a puzzle. Then they match the insets to the geometric cards, an extension to the geometric cabinet. Finally, they make the transition from a solid form to a shape outlined with a pencil; preparatory to recognizing the different shapes of written letters and numerals. Finally, they are used to calculate geometry.