When I watched David Kwong on Ted Talk I thought that it was really awesome how he included all the clues to ultimately solve a interesting  puzzle. In particular I liked how he involved the public in solving a puzzle right there on the stage to ultimately convey the message that we are all wired to solve. See for yourself right here: http://www.ted.com/talks/david_kwong_two_nerdy_obsessions_meet_and_it_s_magic?language=en#t-41949