Azulejos que ensinam matemática, século XVII, Museu Nacional de Machado de Castro, Coimbra

Os azulejos reproduzem fielmente figuras de versão de Os Elementos de André Tacquet, traduzida para português pelo Padre Manuel de Campos, em 1735.

Euclid in tiles: the mathematical azulejos of the Jesuit college in Coimbra, Henrique Leitão, Samuel Gessner
... All evidence leads to the conclusion that they were once applied on the walls of the mathematics room of the Jesuit college in Coimbra and that they were used as teaching aids in mathematical courses.
No contemporary descriptions of this room are known, albeit it must have been an impressive sight with, presumably, more than 200 mathematical tiles. Besides the absence of documents or references to the use of these tiles, a certain mystery also surrounds their fate:
if they were applied to a wall, why were they torn out and most of them destroyed?
The most likely explanation of their dramatic fate amounts to the following: they were torn out from the wall of the Jesuit college in 1759 when, under the orders of the Marquis of Pombal, the Jesuits were banned from Portugal and their assets expropriated.

Other explanation by Susana Pereira
The Colégio dos Nobres, created by the Marquis of Pombal, adopted R. Simon’s edition of the Elements and so did other institutions during the Pombaline Reform.
Thus, as the illustrations of R. Simon’s and Tacquet’s versions were distinct, the tiles were no longer useful as a teaching resource.

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