Ports. Knew that before reading. It's expensive to build a ship; it's an order of magnitude more expensive to build a port. So ships follow ports in design. An

Ports. Knew that before reading. It's expensive to build a ship; it's an order of magnitude more expensive to build a port. So ships follow ports in design. And ports are constrained by their neighborhood (cities and development) and the geography (harbors). I wonder if a sea-based port makes any sense. A floating rail line or undersea train tunnel or skyway or something. To escape the bounds on port design.