I grew up in Europe, and World War II caught me when I was between seven and 10 years old. And I realized how few of the grown-ups that I knew were able to withstand the tragedies that the war visited on them – how few of them could even resemble a normal, contented, satisfied, happy life once their job, their home, their security was destroyed by the war. So I became interested in understanding what contributed to a life that was worth living. And I tried, as a child, as a teenager, to read philosophy and to get involved in art and religion and many other ways that I could see as a possible answer to that question. And finally I ended up encountering psychology by chance.

Well, when you are really involved in this completely engaging process of creating something new, as this man is, he doesn’t have enough attention left over to monitor how his body feels, or his problems at home. He can’t feel even that he’s hungry or tired. His body disappears, his identity disappears from his consciousness, because he doesn’t have enough attention, like none of us do, to really do well something that requires a lot of concentration, and at the same time to feel that he exists. So existence is temporarily suspended.

So what it’s telling you here is that obviously this automatic, spontaneous process that he’s describing can only happen to someone who is very well trained and who has developed technique. And it has become a kind of a truism in the study of creativity that you can’t be creating anything with less than 10 years of technical-knowledge immersion in a particular field. Whether it’s mathematics or music, it takes that long to be able to begin to change something in a way that it’s better than what was there before. Now, when that happens, he says the music just flows out. And because all of these people I started interviewing – this was an interview which is over 30 years old – so many of the people described this as a spontaneous flow that I called this type of experience the “flow experience.” And it happens in different realms.

https://www.ted.com/talks/mihaly_csikszentmihalyi_flow_the_secret_to_happiness