Mr Angry & Mrs Calm

Aude Oliva (MIT) and Philippe Schyns (University of Glasgow) have created an amazing perceptual illusion involving two faces, one of which seems to have an angry expression and the other, a calm one. But if you move further back from the image, the faces in the image swap expressions! Check it out at http://www.ianrowland.com/MiscPages/Mrangryandmrscalm.html (or visit the On The Net blog site at http://www.digitalus.co.nz/onthenet/ for a clickable link)

Check it out...