It can also be seen as all unimportant or unworthy stuff. It's more how you perceive it than what you're specifically doing. Les has a good example of this. The beach in summer is a happy, carefree, exciting and creative place. Kids run in and out of the water, squealing with delight.
People enjoy their play.
They exercise, they daydream and they build. Before they arrive in the morning, the sand is a smooth blanket with no form at all. The grains just lay there in a naturally flat pattern that we call the beach. People come and dig the sand and shape it into castles and dragons and all sorts of amazing structures. They work all day at it, on and off.