This is John Cleese in serious mode with advice on being creative.
(1) Sleep on a problem
(2) Make an oasis – set boundaries of time and space with no interruptions
Finished with the observation that it takes similar skills to know you are good at something as to be good at it. Similarly if you are hopeless at something, you are likely to be hopeless at recognising your lack of skill. And even if you can recognise creativity in others, if you are not creative you may not value that skill in others.