According to worldshipping.org Shanghai is the world's highest-volume container port. Look at all the interfaces here.

This picture conveys the power of interface standards to make possible collaboration among the people responsible for trucks, ships, shipping containers, seaports, handling machinery, roads and bridges, railroad cars, even cardboard containers, and all the interconnecting information technology, some of which is discussed as the primary example in Eric Evans’s book “Domain-Driven Design”.