A new piece for your consideration, in which (as you can see below) it’s the same piece whether the score is right-side-up or upside-down. The title is a famous saying in Hermeticism.1
Here it is right-side-up:
Here it is upside-down — rotated 180°. (Of course each note head will be at the end of its duration instead of the beginning.)
Here’s the pdf: As Above, So Also Below
Here’s the mp3, for glass armonica, clarinet and bassoon:
- See Wikipedia