Without symmetry and proportion there can be no principles in the design of any temple..."
Vitruvius, architect (ca. 70 -25 BCE)

The senses delight in things duly proportioned.
St. Thomas Aquinas, philosopher (ca. 1225-1274)

Nature delights primarily in the circle.
Leon Baptista Alberti, architect and theorist (1404-1472)

Let no one who is not a mathematician read my works.
Leonardo da Vinci, painter etc (1452-1519)

Without [knowledge of geometry], no one can either be or become an absolute artist.
Albrecht Dürer, painter and woodcut designer (1471- 1528 )

Art is harmony. Harmony is the analogy of contradictions and of similars ... Contradictions are ..., with respect to line, those that form a right angle. ... Gay lines are lines above the horizontal; ... calm is the horizontal; sadness lines in the downward direction.
Georges Seurat, (1859-1891)

... I was very interested in theories of mathematical proportions, like the other cubists, and I tried to apply them to my sculptures. We all had a great curiosity for that idea of a golden rule or Golden Section.
Jacques Lipchitz, sculptor (1891-1973)

When I am working on a problem, I never think about beauty. I think only of how to solve the problem. But when I have finished, if the solution is not beautiful, I know it is wrong.
Richard Buckminster Fuller, architect, mathematician, and engineer (1895-1983)