Glo/NaPoWriMo says, "write a poem that prominently features the idea of play. It could be a poem about a sport or game, a poem about people who play (or are playing a game), or even a poem in the form of the rules for a sport or game that you’ve just made up."
Well, once again I'm slacking off and found you a #bookspinepoem instead. It does examine the idea of play, though.
The poets whose books provided the playful titles for this are Susan Andrews Grace, Leslie Greentree, Margaret Atwood, David Fraser and Pat Smekal, and Elizabeth Bachinsky.