This text, written in Spanish and published in Barcelona in 1934 under the title Psicogeometria, is one of the first books written by Maria Montessori (after several general books on the Montessori method: Pédagogie scientifique, la maison des enfants and éducation élémentaire). It forms a set with Psicoaritmetica, and De l'enfant à l'adolescent, while awaiting publication of works that might be entitled Psycho grammaire.
