These book cases are made up of a toon material, which means they can be painted and thinned.
The Gremlin can be found on the lower level on the left side of the room.
Once you’ve done this, the Pipe Organ will thank you and let you move forward.
You’ll get a quick cutscene where he’s put back together along with the “Aw, phooey!
trophy or achievement for your troubles.