Det var var Kirsten Dunst. Du letar efter Upp och ned från 2012.
Adam is a seemingly ordinary guy in a very extraordinary universe. He lives humbly trying to make ends meet, but his romantic spirit holds on to the memory of a girl he loved once upon a time from another world, an inverted affluent world with its own gravity, directly above but beyond reach... a girl named Eden. Their childhood flirtation becomes an impossible love. But when he catches a glimpse of grownup Eden on television, nothing will get in the way of getting her back... Not even the law or science!
IIRC han inventerar ett ämne som det du beskrev som flyter mellan de två världarna. Adam säger också någon gång:
Up there, they always win. And down here, well, we always lose.
Här är trailern: