Remember good old Euclid and his work on geometric algebra? Something magic happens to the ancient theorems when Oliver Byrne (1810-1890) applies some color and principles of visual design. Excerpt from Byrne’s introduction: “We do not introduce colours for the purpose of entertainment or to amuse […], but to assist the mind in its researches after truth, to increase the facilities of instruction, and to diffuse permanent knowledge”. And remember, we are talking A.D. 1847. I love it!