I found this wonderful poem about Sacred PLAYFULNESS by Peter Gray. 

Sonnet to a Playful God
In play we learn to think in ways most clear.
In play with others we resolve our strife.
In play we laugh at what provokes our fear.
In play we soar above our routine life.
In play we learn to follow rules we share,
Assert our selves while making others smile.
In play what’s right is what to all is fair.
In play it’s fun to go the extra mile.
And so to you the god of play we pray,
Please keep our ludic spirit’s liveliness.
As we approach the trials of each day,
Protect us from our over-seriousness.
From dust to dust we all end up the same.
What counts in life is how we play the game.
More here.