flipping gravity based on angle of iphone?

Hi all,
I would like to make a game that flips the world gravity based on which side of the iphone is facing down. is this possible? if so how do i determine which side of the iphone is facing down?
Thanks for your help!
I would like to make a game that flips the world gravity based on which side of the iphone is facing down. is this possible? if so how do i determine which side of the iphone is facing down?
Thanks for your help!
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