A diptych painting by pop artist Roy Lichtenstein. Also known as "Whaam!"

The left-hand painting is a comic-book style image of an American jet. Over the pilot's head is a bubble containing the words "I pressed the control... and ahead of me rockets blazed through the sky."

The right hand painting shows another aircraft exploding in a ball of flame and the word WHAAM! in huge, gaudy, yellow letters.

It's wonderful.