Montessori Quote
The differences are exactly measured in the cylinders. The difference between the first and the second is similar to that between the second and the third. The diameter of the cylinders is one centimetre, one and a half centimetres, two centimetres, and so forth, so the unit of the measure of gradation is half a centimetre. It is an organised gradation. It is an ordered, methodical, measured gradation.
Maria Montessori, The 1946 London Lectures, p. 82
