On top we see a girl placing the geometrical figures u-ith careful, intentional movements on their bi-dimensional reproduction. Below a boy uses the ** constructive triangles" to compose quadrangles known to him through the geometrical figures. Top: Photo bv Mrs. V. A. Baker in an English Montessori School. Bottom: Montessori School, Adyar, Nfadras, India. Photo by C. T. Nachiappan.