I haven't read the book, but I think "concrete zoos," for humans, is more metaphorical than literal. Humans find comfort in much wider ranges of environment. If

I haven't read the book, but I think "concrete zoos," for humans, is more metaphorical than literal. Humans find comfort in much wider ranges of environment. If it were available, I'm sure many would find spaceships to be comforting environments. IMO, the problem is that we're at this stage of social development, where capitalism, and the antiquated culture of jobs, management and deadline, is actively incentivized to limit human potential and creativity. Why? Because that's where competition comes from.