 Sand on a beach is free. That same sand, if you want to put it in a playground, is going to cost you. You got to go to the store and buy bags of sand because it's used differently. If you want sandpaper, all that is is sand glue on paper. But you got to go to Lowe's or Home Depot or someplace. You got to go buy sandpaper. It's that same free sand. And don't go to Silicon Valley.