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Geometry Lesson in Txatximinta condenses, in its title, two of the artist's main interests, geometry and the geographic layout of the Basque region. In this case, he refers to mount Txatximinta in Bizkaia, standing between the towns of Mungia and Armintza, which Tamayo chose at random when looking at a map. Presiding over the composition is a huge cube situated in an interior that recalls the concrete bunkers built years ago and which still survive in the area, with openings through which the blue of the sky and the sea is visible. Accompanying it are geometric structures---a pyramid, a cone---and a number of instruments used in technical drawing, including a protractor, a set square, a compass and pencils, which are fitted into the three-dimensional area of the painting. [Marta García Maruri]

Selected bibliography

• Guía Artistas Vascos. Bilbao, Museo de Bellas Artes de Bilbao, 2008. pp. 181-182.
• Gida Euskal Artistak. Bilbao, Bilboko Arte Eder Museoa, 2008. pp. 181-182.
• Guide Basque Artists. Bilbao, Bilbao Fine Arts Museum, 2012. pp. 181-182, n° cat. 101b.
• Viar, Javier. Historia del arte vasco : de la Guerra Civil a nuestros días, 1936-2016. Bilbao, Bilboko Arte Ederren Museoa-Museo de Bellas Artes de Bilbao, 2017. pp. 597-598, 600, il.
• Bilboko Museoaren alfabetoa = El alfabeto del Museo de Bilbao = The alphabet of the Bilbao Museum = L'alphabet du Musée de Bilbao [Cat. exp.]. Bilbao, Bilboko Arte Ederren Museoa-Museo de Bellas Artes de Bilbao, 2018. pp. 219, 221, n° cat. 121.
• Después del 68 : arte y prácticas artísticas en el País Vasco, 1968-2018 [Cat. exp.]. Bilbao, Bilboko Arte Ederren Museoa-Museo de Bellas Artes de Bilbao, 2018. p. 340.