My daughter showed us the key: misery gives way to fun when you take an object, event, situation, or scenario that wasn't designed for you, that isn't invested in you, that isn't concerned in the slightest for your experience of it, and then treat it as if it were. ...this is what play means.

By manipulating the physical configuration of [any situation], you make it produce a subset of the infinite pattern of [possibilities]. And even if you don't know how to play [above situation], you can still play with it.