Playing isn't necessarily what you may deem as child-like behavior. It can be expressed in a multitude of ways. Playing is often free of I should, better, need, or have to. But even those ideas can be played with.
˙ǝʌıʇɔǝdsɹǝd ɥsǝɹɟ ʎןǝɹıʇuǝ uɐ ɯoɹɟ ɯǝɥʇ ǝǝs puɐ
'pɐǝɥ ɹıǝɥʇ uo sɐǝpı uɹnʇ oʇ unɟ s,ʇı