A baseball zooms through clouds, straight through a wall and into the waiting hand of actor Adam Smith, who is tricked out like a magician, complete with wand, tuxedo and top hat. â€How do you do it?†Smith asks conspiratorially. â€You just need a small enough ball, of course.†But Smith isn´t really explaining a magic trick. He´s talking nanotech, in the new short film When Things Get Small.