The earth is the Lord's. Psalm 24 basically says the earth is God's property. We have been given the privilege and responsibility of living on earth to see it isn't ruined.
I do not believe in pure idioms. I think there is naturally a desire, for whoever speaks or writes, to sign in an idiomatic, irreplaceable manner.
That freedom that Picasso afforded himself, to be an artist in a huge number of ways, seems to be a huge psychological liberation.