Just as our initial conversations on inspiration and interfaces led to this book, our current conversations venture further into the boundary spanning landscape. We did not set out to work on the edges, nor are we the first ones to dive into this concept. We did not always have the words or a name for what we were doing. We only knew that without it, things fell apart faster. The systemic challenges cities carry will not be answered by individual boundary spanners doing good work in parallel. They require us to genuinely build together. Walk with us. Reach out to us.