by Maria Popova
"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 social psychologist and London School of Economics co-founder Graham Wallas, sixty-eight at the time, penned The Art of Thought— an insightful theory outlining the four stages of the creative process, based both on his own empirical observations and on the accounts of famous inventors and polymaths. Though, sadly, the book is long out of print, with surviving copiessold for a fortune and available in a few public libraries, the gist of Wallas’s model has been preserved in a chapter of the 1976 treasure The Creativity Question (public library) — an invaluable selection of meditations on and approaches to creativity by some of history’s greatest minds, compiled by psychiatrist Albert Rothenberg and philosopher Carl R. Hausman, reminiscent of the 1942 gem An Anatomy of Inspiration.
"Wallas outlines four stages of the creative process — preparation, incubation, illumination, and verification — dancing in a delicate osmosis of conscious and unconscious work. These phases, which literary legend Michael Cowley would come to parallel in his 1958 model of the four stages of writing, go as follows:"
Via Jim Lerman