Introduction from the Montessori Research and Developemnt Manual.
In the Children's House, the presentations are at the level of movement and word. This movement is of the eye and had. The children trace the figures with the utmost care. This is done with the standard three-period lesson. The teacher traces each figure and gives its name. Then she repeats the name of each figure as she places it on the mat. She proceeds to the second period, asking the child to show her various figures in response to oral leads. Finally, in the third period, she points to a figure and asks the child to name it. In this lesson, there are usually three figures involved. Very few words are used. The important concept we want the child to absorb is the name of each figure.
Here is a great video on how to present the circle drawer to the Primary Children. Geometric Cabinet Presenation
There are two homeschool videos on You Tube on the Geometry Cabinet...this is NOT the way to do it.