Although this refers to art, it seems the same in other forms of invention: there is sometimes a curious connection between constraint, without constriction, and creativity.

‘Then, too, forcing yourself to use restricted means is the sort of restraint that liberates invention. It obliges you to make a kind of progress that you can’t even imagine in advance.’

Source: Picasso quoted in Françoise Gilot and Carlton Lake, Life with Picasso (Harmondsworth: Penguin 1966) (McGraw-Hill, 1964), p. 49

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