Discovering that some people don’t like to hang things from their ceilings should not have surprised me. Ceilings are a little more difficult to work with than walls. So the wall mobile solves that problem.
Extra: In response to a comment from a viewer, here is a picture of the glow-in-the-dark mobile (not glowing in the dark). This is a very light mobile so the wires are very thin. They are all 18 gauge steel.