Sensorial exploration of plane and solid figures at the Primary level (Ages 3 to 6): the children learn to recognize the names and basic shapes of plane and solid geometry through manipulation of special wooden geometric insets. They then learn to order them by size or degree.
- Stage I: Basic geometric shapes. (Age 3-4)
- Stage II: More advanced plane geometric shapes-triangles, polygons, various rectangles and irregular forms. (Age 3-5)
- Stage III: Introduction to solid geometric forms and their relationship to plane geometric shapes. (Age 2-5)