Robert Silverberg

Robert Silverberg writes conceptual science fiction.

The Longest Way Home (2002)
A young aristocrat learns the truth about his society as he attempts to get home.
4 star rating

The World Inside (1971)
Life inside a skyscraper, crowded in with thousands of other people.
3 star rating

If you like Robert Silverberg's work, you might also enjoy the following:

Earth Is Room Enough by Isaac Asimov