There are multitude of wonderful sources in the humanities
on the world wide web.
This site is called "Mathematics and Music".
http://plus.maths.org/issue35/features/rosenthal/index.html
This shows an image of La Parade by Georges
Seurat:
http://www.artchive.com/artchive/S/seurat/parade.jpg.html
This site is the Princeton University Library
Papyrus home page and has links to many other library and
sources:
http://www.princeton.edu/papyrus/index.html
This site discusses perspective:
http://mathforum.org/sum95/math_and/perspective/perspect.html
This site discusses the Parthenon:
http://academic.reed.edu/humanities/110Tech/Parthenon.html
Mathematics and Music, along with a bibliography
and many links:
www.math.niu.edu/~rusin/papers/uses-math/music/
Mathematics and Art:
www.math.toronto.edu/coxeter/art-math.html
Mathematics and Visual Arts on M.C. Escher:
http://mathcentral.uregina.ca/RR/database/RR.09.95/hanson8.html
