Ruby asks Tom about the buttons, and he tells her that they are buttons. He's only tried the middle one. Ruby spends a moment thinking while she fishes the tiny chest out of fish tank, then asks Tom for the metal plate from his Opus (the other pieces are a can and a letter opener), tells him to press some buttons, and asks what the hatch over his head is. He refuses the plate, since it is part of art now. Also it wouldn't fit through the grille. He won't push the buttons because when he tried the middle one it shocked him. He doesn't know what the hatch is, and has never seen it open.
Ruby tells Tom she doesn't believe him about the buttons, and he is miffed, saying that's fine because he doesn't trust her either. She then asks what it says on the metal plate, but he won't tell her the magic numbers because he doesn't trust her. Ruby gives Tom a fish as a peace offering, apologizes, and says she was just jealous of his opus. He feels better, and turns it so she can see the numbers on the plate. It says, "211".