The Ark Class ship formed part of the three-fold survival plan of the wealthy and powerful of the Petroleum Age. The other two legs of the plan were the arcologies, and space habitats.
A certain culture has a curious pass-time- muscle art.
Muscle artists (who are called by a special name) work hard to sculpt their bodies, trying to become as muscular and buff as possible. The best among muscle artists look almost grotesque in their amazing muscularity, Atlas-like giants with shiny, oiled iron arms and legs.