It's (afaik) the original cover for one of The Culture novels by Iain M. Banks. It depicts an interstellar ship that is basically the size of a small country and can house as many people. It's controlled by, and essentially is, a "Mind" which is that worlds term for A.I., but like actual A.I., not whatever the hell the venture capitalists are pushing today.

It's also the source of the term Fully Automated Luxury Gay Space Communism.