Here’s an illusion Greg sent in the other day. If you look at the #Mona Lisa below, while at the same tim tilting your head, the image will appear to move! Even better effect can be achieved if you move your head closer, and then further away from the screen. I think Mona Lisa is one of the most often used motives on this site. Just search our archives for her, and you’ll be amazed how often she has appeared in the past. But still, this post featuring Mona Lisa was my favourite.