These black and white illustrations by Istvan Orosz are masterpieces in their own right, but the fact that there is a skull hidden in each piece makes them an optical delight!
If you're having trouble finding the skull try looking at a smaller sized version of each piece and the grinning face of death should be easier to spot.
Fitting his name horizontally into the rectangle, he managed to spell Ossa (bones) down the left side.