This site is called "Mathematics and Music".
http://math.niu.edu/~rusin/papers/uses-math/music
This shows an image of La Parade by Georges Seurat:
http://sunsite.org.uk/cgfa/seurat/p-seurat9.htm
This shows an image of Last Supper by Duccio:
http://sunsite.dk/cgfa/duccio/p-duccio13.htm
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//jcccnet.johnco.cc.ks.us/~jjackson/part.htm
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