When I was a kid, books were a way to expand my world beyond what people around me knew and talked about.

Then the web became a way of further expanding my world.

Today talking to my neighbours is the best way to expand my world beyond what is available online.

Most people live in world much smaller than the one I inhabited in my childhood.

When kids get together they watch their phones and talk about what they see online.

A slave in ancient Rome who couldn’t leave the plantation saw more of the world than most people today — even those who travel around, go to school, and watch documentaries