Is the pebble two-dimensional and drawn onto the paper, or is it a three-dimensional pebble sitting on top of the sheet as a paperweight?...

What do you think of when you try to conceptualize nothingness? Is it the black depth of deep space? Or the emptiness of a white piece of...

M.C. Escher is recognized for his two-dimensional works, few people are aware of the sculptures he created. The top picture shows Escher...