Play (n.) is crucial to humanity as the dynamic principle of fantasy. No creative work has ever yet come to birth without play. The debt we owe to the play of imagination is incalculable.
Play (n.) makes man whole: he plays only when he is a man in the full sense, and is wholly a man only while he plays.
Play (n.) that is creative is not a matter of wanting to play but of having to: serious play from inner necessity, which looks like mere play from outside — the ambiguity that clings to everything creative.
Play (n.) gave the alchemists their name for part of the hardest work there is — ludus puerorum, "child's play" — and points to the co-operation of infantile, unconscious forces, the hobgoblins and Cabiri.
Play (n.) is where man becomes completely human.
Play (n.) and unconscious products spring from the same sportive fantasy, so the line where play begins is hard to draw; the human mind has amused itself with number games for millennia, and such tendencies get a hearing in dreams.