21 Mind-Boggling Optical Illusions That Will Melt Your Brain

11. Mysterious Dot

This might look like some sort of loading indicator but this is pretty cool. Keep looking at the center of the picture and a green dot will appear that's not really there. In fact it's an after image left in your eye. If you keep looking, all the purple dots should disappear.

10. Spinning Dancer

Similar to the endless tube train of doom from earlier. Again it's hard to tell which direction the dancer is going. Look closely at the spinning dancer and she should change from spinning clockwise to anti-clockwise.