Some beautiful mathematics from Matt Baker.
This lecture was particularly beautiful (and even true?):
Explaining Beauty in Mathematics: An Aesthetic Theory of Mathematics | Mathematical Association of America
A new book that could be of interest:
Videos from the Simplicity conference. (The Graduate Center, City University of New York, April 3–5, 2013, http://s-i-m-p-l-i-c-i-t-y.org/)
Including: Étienne Ghys, Jan Zwicky, Hugh Woodin, Dusa McDuff, Juliet Floyd…
An interesting discussion about an important question. Feel free to join!
A very accessible account of the recent work at UCLondon on beauty in mathematics: