Today I assembled a complex of tunnels-with-skylights for Rover (he avoids tunnels too dark to see in).

The tunnel complex before he moved a few items around.
The good news: He no longer hesitates to climb the ramp that’s made from a metal gate. He also wasted no time exploring every single tunnel, and examining all paths around the tunnels.

This ramp is no longer scary!
The hilarious news: He now gets to learn what things support his current weight and what happens when they fail.

Head first. Good thing the external wall is soft!

I was trying to take a pic of him standing precariously over the edge of the box with one claw on the mesh, but this is even sillier.