>Play of all sorts has “time-in” and “time-out,” though that is more obvious for some forms of play than others. Time-in is the period of fiction. Time-out is the temporary return to reality—perhaps to tie one’s shoes, or go to the bathroom, or correct a playmate who hasn’t been following the rules. During time-in one does not say, “I am just playing,” any more than does Shakespeare’s Hamlet announce from the stage that he is merely pretending to murder his stepfather.<

Peter Gray - Free to Learn

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Der Wechsel zwischen verspieltem und ernstem Verhalten - ohne Ankündigung;