A gem of a place to roll away the worry!

"...The Scratch Patch, a tiny, urban oasis of polished gemstones that carpet the floor like a shallow ball pit. Climb in, sit among the shifting stones and hear them clack gently as you search for treasures. Stones are sold by the bagful -- $4 for small (about 16 stones), $8 for medium (about 38 stones) and $15 for large (about 56 stones)..."