In the process of creation, be it drawing, sewing a quilt, building a greenhouse, writing a story or piece of music, dancing, the mind enters an Alpha wave state of deep
concentration. It's an altered state of awareness in which one looses track of time, and concerns that normally occupy the mind are temporarily forgotten.
This state of waking hypnosis brings relief from stress and allows the subconscious an opening where that ah-ha moment, that sudden understanding or solution can present itself.
This has happened to most of us.... we tackle a problem without success, and as soon as we let it go and do some other, perhaps mundane, task, the solution pops up in our mind. Viola!
You can find more information on creative processes here: