Graham Wallas · 1926 · PDF · Calibre ID 13262
Resurfaced in The Person Who Waits (2026-10-23).
Role in the triad
Hinge: secularizes incubation and illumination as stages of thought; states the observation problem (corona/eclipse)
Why this book
Where ‘incubation’ and ‘illumination’ enter the modern vocabulary of creativity without the cult behind them. Scanned PDF with no text layer: chapter IV OCR’d with tesseract; quotes from that OCR, PDF page locations.
Quotations
Verified against the book’s own text on the day of the reading.
- “it is desirable not only that there should be an interval free from conscious thought on the particular problem concerned, but also that that interval should be so spent that nothing should interfere with the free working of the unconscious or partially conscious processes of the mind. In those cases, the stage of Incubation should include a large amount of actual mental relaxation.” (ch. IV, PDF p. 103)
- “Even in exploring the same problem, the mind may be unconsciously incubating on one aspect of it, while it is consciously employed in preparing for or verifying another aspect.” (PDF p. 97)
- “And yet a thinker of good health and naturally fertile mind may have to be told that mere industry is for him, as it was for Trollope in his later years, the worst temptation of the devil.” (PDF p. 104)
- “in that periphery or ‘fringe’ of consciousness which surrounds our ‘focal’ consciousness as the sun’s ‘corona’ surrounds the disk of full luminosity.” (PDF p. 111)
- “Each was followed by a period of Verification, in which both the validity of the idea was tested, and the idea itself was reduced to exact form.” (PDF p. 96)
Themes
fringe consciousness · Helmholtz · illumination · incubation · industry · Intimation · mental relaxation · Poincaré · Preparation · Verification