Graham Wallas model of creative process
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The Art of Thought: A Pioneering 1926 Model of the Four Stages of Creativity
In 1926, thirteen years before James Webb Young's Technique for Producing Ideas and more than three decades before Arthur Koestler's seminal "bisociation" theory of how creativity works, English ...
https://www.brainpickings.org/2013/08/28/the-art-of-thought-graham-wallas-stages/