Restriction: Work upside down. Create something in such a way that you have to rotate it 180 degrees to display it when it is finished.
I’m bending the rules on this one. Made a quick glacial song, recording most of the parts reversed. That’s sort of like upside down, but in time, right?
Here’s the file:
(Still working on my streaming player plugin so I can quickly post little audio experiments as easily as I’ve got the photos working.)