Ella Eyre "If I Go" (Henry Scholfield, dir.)
Here's a perfect example of using in-camera tricks to create the illusion of zero gravity...
Henry Schofield, director:
"-So the ceiling is the floor? - Yes... No... First the floor is the wall then the floor will be the floor...
The concept itself threw up a lot of technical challenges and no less in the semantics of which way is up, at what point and for whom.