Look at all the pretty lights in this bathtub! This is for the cats, although you get the idea that they are more interested in the moving objects than in the colors. But why would you go to all this trouble to entertain your cats in the bathroom? Johann Rosenberg had a reason for every facet of this bathroom redo. When you hear the story, it all makes sense. What's wrong with dedicating one bathroom to the cats? Nothing, except we learn that Rosenberg only has one bathroom, and all this stuff has to be portable so he can use the room himself.
This project may remind you of the old woman who swallowed a fly, in that one project leads to side effects, which leads to another project, and so on. But in this one, he ended up with a cool video with both pretty light effects and cats. You can't go wrong with that combination!