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.
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Fitting his name horizontally into the rectangle, he managed to spell Ossa (bones) down the left side.
The men who work here, without protective gear or machinery, break chunks of sulfur that form when sulfurous steam is cooled into pools of red molten sulfur. They protect themselves from sulfuric acid vapor with damp rags over their faces, and carry baskets with chunks of sulfur on their backs, climbing and walking several miles in and out of the crater.