Thanks, guys.
Arnaud, I would, but I can't put holes in the ceiling.

We used to have that big plane hanging from the A/C vent in the ceiling, though.
I've thought it would be cool to do space exploration on the top shelf, then airplanes on the next, then swiss alps, then boats on the ocean, then underwater, moving on down through the altitudes.

Or I could move down through history, starting with the dinosaurs.

Then cavemen, egyptians, romans, pirates, western.