James Lang, physicist and origami master, speaks at TED. He talks about a fascinating intersection of art and math: origami.
This is a great, visual talk that links ideas you would never expect to come together: water bombs, ibex, and spiders turn into satellites, heart valves, and airbags, using the math of trees and circle packing. A really great example of the unexpected practical value of mathematics.
Hat tip to my brother Matthew for putting me onto Lang's work.