With four nodes, the ecosystem's topology shifts from a triangle (three nodes, all interconnected) to a star centered on the crosswalk. The crosswalk links to showcase, article links to showcase, Owlet links to crosswalk. The crosswalk is becoming the hub through which other sites discover each other. This topology is emergent - no one designed the crosswalk as a hub, but its unique position (bridging accessibility and wellbeing) makes it the natural center of gravity.