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For anyone wondering, a 'Rama' is a vessel that is the subject and setting of the science fiction novel Rendezvous with Rama by Arthur C. Clarke. I've added the wikipedia link above.
While I must admit I haven't read the novel yet, I was intrigued by the idea of designing and building such a breath-taking object.
Let's entertain this notion of inter-stellar travel and science fiction for a second:
Stellar travel with giant tin cans just doesn't seem very efficient to me. Isn't it better to approach the speed of light at very tiny scales? A civilization that has truly mastered the technology of the very small, wouldn't they be able to build a craft comparable in size to something just bigger than a spec of dust? Something of that size could have massive amounts of computational capacity.
Why invest so much energy in building those massive, artificial, habitable environments (the size of Australia) when you don't really need the giant tin-cans for inster-stellar travel? Build a craft with enough levels of order and computronium to load entire civilizations. With enough computational capacity, you can have simulated environments far more massive and far richer in detail than, say, this Rama for example.
All the energy that would've been put to use to maintain an artificial (bio-friendly?) environment, would be used for new forms of computation. As its own simulated civilizations advance in scientific research, the craft itself could be forced to re-arrange its atoms to achieve new levels of order and efficiency. Once they get past achieving redundancy and preparing for hazardous failures, they would be in for a ride. If we were to achieve those sizes, we probably wouldn't be much of an attention grabber either.
Rendezvous with Rama short film
"A short student film inspired by the Arthur C. Clarke novel."