Yesterday I found a really cool video from Buzzfeed. Ordinarily I wouldn't bother you with two vids from the same source, but this one is irresistible. You've probably seen some of these optical illusion photos before, but grouped together for this video they are even cooler. More after the jump.

YouTube

You may have seen the bathtub "boobs or not boobs" and the "tiny man riding a woman video" but there's a lot more here.  In fact there are 15 more great optical illusion photos here, because this is "17 Photos You Need To Look At To Really Understand".  The funny thing about this video is, it doesn't really give you long enough with each picture to "understand".  So enjoy: