Some examples are significant. I'm thinking of when a teacher in electrical engineering 
 once showed us a picture which supposedly was the Eureka moment inspiration for 
 the inventor of the 'phase-locked loop' circuit. It was like a cartoon image of a fox 
 chasing a chicken in circles over a fence (ie. fox jumps over fence always just missing 
 the chicken, which has gone over the fence to the side that the fox was on a moment ago etc. etc.)