Why is it embarrassing? Maybe he's afraid of heights, which is entirely natural, but he still wants to capture the moment.
Let the guy be, he did nothing wrong to anyone!
An aquarium might be cool, especially if it has cool lights.
A decor piece, such as a vintage statue or collectible could also work well, provided you make some finishing changes to the walls (different texture to signal that's an intentionally particular place), lights (must not