There is a great story (I can’t find via Google) about two different approaches to design. Imagine you have a corporate campus, and are trying to decide where to put paved footpaths between buildings. The normal approach is to do this before you build the campus. You can tell when a campus has been designed this way, because nobody uses the footpaths and you can see dirt paths people have worn into the grass.

The second approach is to build the campus, but don’t put the paths in at first. Wait until dirt paths emerge in the grass as people walk between buildings over the first few weeks, then pave those paths.