I was embarrassed that I lost our work, so I rewrote it from memory, straight off in a hurry. Then I discovered the original and the one I’d done very quickly was better than the original. I didn’t spend any time thinking about it, so how could it be better than the original?
The only thing I could think was that my unconscious had been working on the sketch and improving it ever since I wrote it. I began to see a lot of my best work seemed to come as a result of my unconscious working on things when I wasn’t really attending to them."
— John Cleese, from a great talk on creativity.