Whats the message and point of Doodlebug??

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i just found a short 3 minute video written and directed by Chistopher Nolan called 'Doodlebug'. You can see it on youtube. i was just wondering what the message and main point behind the short film actually was, i have a few ideas but interested to knw what others think.



It's just paranoia pure lynch style, don't you agree?