What work of art, music, science, mathematics or literature has surprised or unsettled or challenged you, and in what way? Please limit your response to half a page, or approximately 250 words.

289-word version:
...In the middle of my room was the piano which I have not touched for five years since I stopped going to piano lessons. Entering my room, my cousin gently opened the piano and sat in front of it. She opened the music book and started to play “Moonlight” composed by Beethoven...