Take an empty oatmeal or salt cylinder box and make a wonderful Montessori geometric shape, a cylinder. Make it pretty by covering it with paper or paint. Draw and color the cylinder on a card and show your preschooler how to match the cylinder to the card..
Use square and rectangular boxes to make more solid shapes.
Introduce the cylinder, rectangle and square boxes using the 3 period lesson. Match the 3 different boxes with the shape cards.
For a more advanced game, write the name of the shape on each card (nomenclature card).. Make labels to match these nomenclature cards. Your child can label the cards and shapes.