Give me a sphere!

Curious as to how a musical box plays music, I opened one to see what was going on inside. A large cylinder with little bumps would turn, and the little bumps would hit the blades of a silver comb to create music. As I listened to the music I heard strange little squeaks every so often, seemingly unrelated to the melody that was playing. I thought it might be the squeaking of a poorly greased gear turning inside of the contraption. Upon closer inspection, to my surprise, I found the ultimate source to which the music owed its very existence. A small little mouse, running inside of a wheel, was giving the gears of the music box the power to create the music that filled the air. "How do you keep going?" I asked him.

"The same song plays, but I hear something different every time."

The mouse seemed to miss the more obvious curiosity of his continuous presence. So I inquired again. "How do you survive in that wheel?"

...

The mouse said nothing but as I waited for his answer I found myself mesmerized by the song that was playing. It had already started over once, but in the hypnosis brought on by the spinning gears I found myself in the deepest recesses of the song, and all my senses had faded except for my hearing, which was sustained and strengthened each time the song would start over.