From Eric Zimmerman’s The Rules We Break:
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Play is all about that vulnerability, about being responsive, yielding to the moment. You might not be playing, but if you are willing to play, at the drop of a hat, the bounce of a ball, the glance of a toddler, the wag of a tail—then you are open to any opportunity. You are loose. Responsive. Present.
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To play is to play with something, to question something that might not be meant for play and to do something inappropriately playful with it.
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To play with something is to explore its possibilities, to test its limits, to move beyond the functional and utilitarian and into the realm of the unexpected and inappropriate.
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Play is free movement within a more rigid structure. Like a loose gear, the wiggling movement of play happens because of, but also in opposition to, the logical systems on which it depends.
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Play is a second-order design problem. You can’t design play directly—you only design the circumstances under which it might arise.

Muni's Play