Black Holes are so dense, and produce such intense gravity, that even light can not escape. Theoretical physicists predict that there are situations under which light can escape (which is called Hawking radiation).
Heinz ketchup poster - in this poster, designer put the stalk of tomato on top of the ketchup bottle to represent tomato. Designer used just two elements(ketchup bottle and tomato top) but now it show new aspect from that. It's simple but smart.