““At intervals along the walls the tiles gave way to large mosaics—simple angular patterns in bright colors. Trillian stopped and studied one of them but could not interpret any sense in them. She called to Zaphod. “Hey, have you any idea what these strange symbols are?” “I think they’re just strange symbols of some kind,” said Zaphod, hardly glancing back. Trillian shrugged and hurried after him.””