George Downes created this momento mori in an optical illusion style.
I've enjoyed optical illusions since I saw my first ones as a child. This one is particular interesting, because the blurred edge darkens as I tilt my computer screen up. This gives it a darker and more eerie quality. I could see this being a more eerie illusion when seen at different angles and under different lights. The blurring is great on this skull illusion, because the features darken and become more prominent with less light.