Yep, and it works for grey scale too. This is the one I find the simplest: http://3.bp.blogspot.com/-FLbAdn2URJs/Toim-B864TI/AAAAAAAAOc4/cBJ44hm9SIM/s640/gray

Yep, and it works for grey scale too. This is the one I find the simplest: http://3.bp.blogspot.com/-FLbAdn2URJs/Toim-B864TI/AAAAAAAAOc4/cBJ44hm9SIM/s640/gray+optical+illusion.jpg http://3.bp.blogspot.com/-FLbAdn2URJs/Toim-B864TI/AAAAAAAAOc... And a video of a similar effect: https://www.youtube.com/watch?v=z9Sen1HTu5o https://www.youtube.com/watch?v=z9Sen1HTu5o