I came across this video on Richard Wiseman’s blog. I knew many of the optical illusions showcased in the video but still it is a great collection put together by BuzzFeed. http://www.youtube.com/watch?v=4vTyEy7Dn70 How many did you get right? And another one on BuzzFeed: http://www.youtube.com/watch?v=PxGB2Zz4R04#t=44