An entire city lives and breathes unaware that the real world is going on all around them. Trapped, placed in a capsule be whatever you think could put it there. No world, no galaxy or dimension but a city, a bustling city full of millions of people.
Every single organism, unaware that they are nothing more than a science experiment for something with an intelligence that far exceeds their own.
What happens when the capsule is opened and the truth is exposed?