If you mix play sand with a little bit of polymer (polydimenthyl siloxane) and add a few other non-toxic chemicals, you'll get kinetic sand. Its particles flow freely and loosely stick together, turning it into playful 'concrete'.

If you mix play sand with a little bit of polymer (polydimenthyl siloxane) and add a few other non-toxic chemicals, you'll get kinetic sand. Its particles flow freely and loosely stick...