ClojureScript full-stack framework demonstrated in the talk as the runtime for a React component that issues Pathom/EQL queries. The speaker composes Fulcro apps inside other Fulcro apps (the Workspaces environment is itself a Fulcro application) and uses Fulcro Inspect, a Chrome DevTools extension implemented as yet another Fulcro application, to trace operations and network calls. Speaker compares this recursion to 'what rails engines should have been' — reusable applications that actually work.