I'm not normally a fan of Chris Nolan's work (save his Batman trilogy) but this thing I really dug, even though it's quite the lofty sci-fi concept - as is most of Nolan's films - it's super entertaining...just don't think too much about the plot holes...like...if one has been 'inverted' - imagine what eating food would be like...(let alone going to the toilet - as I said, best not to ponder too closely) but it's a fascinating and fun romp, not too violent, only one F word. I highly recommend this one !