Unless you've been hiding under a rock, you've probably seen "The Dress" and you probably have your own opinion on what color it is. The debate on whether it is blue/black or white/gold has been tearing apart everything from friendships to marriages and even our office couldn't resist discussing optics and color theory because of this dress. Of course this dress isn't the only thing out there playing tricks on your eyes and your mind so we've rounded up some of the coolest architectural optical illusions for you to puzzle over, just in case the dress isn't frustrating enough.

Shadow Skylines

Nelson Mandela Columns

The Rachel Raymond House

Floating chairs

Australian Customs Service Building