There is a painting by Klee called Angelus Novus. It shows an angel who looks like he wants to move away from something he is staring at. His eyes are wide open, his mouth is open, and his wings are outstretched.
Paul Klee, Public domain, via Wikimedia Commons page 
The angel of history must look like this. He has turned his face toward the past. Where we see a chain of events, he sees a single catastrophe that piles wreckage upon wreckage and throws it at his feet. He would like to linger, to wake the dead and reassemble the shattered. But a storm blows out of Paradise, which has caught his wings and is so strong that the angel can no longer close them. This storm drives him inexorably into the future, to which he turns his back, while the pile of rubble before him grows into the sky. What we call Progress is this storm.
~
Walter Benjamin, Über den Begriff der Geschichte (1940)
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