Many years ago I used a binder clip to entertain my baby. He was still in one of those baby recliner chairs all the time, and not yet mobile so easily bored.
The recliner chair sat on the coffee table with him in it, and I put a hook in the ceiling with a string attached to the hook, and at the other end of the hook I attached a binder clip.
And every hour or so I would clip something new onto the binder clip: a little toy, a tinfoil pie plate, a set of keys, whatever was handy. And he would look at it and bat it around and just generally amuse himself with it.
Hours and hours of versatile baby entertainment.