Ever wondered what you'd look like with Brad Pitt's face?
Artist Arturo Castro has made this kind of fantasy a freaky reality, with technology he calls 'realtime face substitution' that transposes features from one face onto another. He mixed technologies including Kyle McDonald's ofxFacetracker + Jason Saragih's facetracker library to create the effect, which he says works better with real faces than cartoon faces. So, celebrities watch out - your doppelgangers could soon be walking around. It's scary stuff.