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Maria Montessori. ‘Psychogeometry’ demonstrates the originality and brilliance of Maria Montessori’s own mathematical talents. This, combined with her deep understanding of the psychological workings of the child’s mind, enabled her to offer an approach to mathematics that is irresistible and fascinating. Based on her Italian manuscript and the 1934 Spanish edition. • The Montessori Series: 233 pp, hard cover, 2011 edition, Volume 16.