A few years ago I spent some time in Prague without much to do for most of the day. The core of the city is beautiful and modern, but as you get to the outskirts, things are a bit grittier. And that’s where my hotel was: miles from downtown, next to a big rail yard. A rumbling train came by every 40 minutes, all night long, past my open window. One day I walked down the road from the hotel, past a lot of rails and great big mechanical stuff, and happened onto a colorful sight.
