Endpapers of Six Centuries of Type & Printing within book standing open to see them: red endpaper covered with typographic elements in black in a repeating pattern, including T-square, ink ball, phototype strip, printing press, brayer, early Macintosh, and others.
https://cdn.masto.host/twitsocial/media_attachments/files/111/687/786/225/069/202/original/96137623d83a3e96.jpeg