Joy — or something like it — must pervade the vast universe as a whole. The wheeling of planets around the sun, the rush of galaxies over the horizon of visible space and time, and the spin of electrons all seem like the joy we feel when we whirl around at the behest of natural forces — swinging, diving, riding a merry-go-round. These are not occasions of tension but of deep release, of equilibrium, of exciting vertigo. They are play — play is moving equilibrium, and in it joy wells up. Play is active joy.
— Robert Ellwood, Finding Deep Joy