"I'm not responsible what other people think I'm able to do. I don't have to be good because they think I have to be good. Then I thought to myself - I haven't done anything important... Well I'm never gonna do anything important.... But I used to enjoy physics and mathematical things because I used to play with it. It was never really important, but I used to do things for the fun of it. So I decided I'm going to do things only for the fun of it. And then, when playing with things in the relaxed fashion as I had originally done; everything just poured out."
We hear this a lot from many brilliant minds, including Einstein. When ideas pour forth from a basic idea in a relaxed state of mind. That's where pleasure and creativity meet.
THE PLEASURE OF FINDING THINGS OUT, Richard Feynman Interview (1981)