Below is a live Cairn model of an autonomous delivery rover — the same one from the story. Click nodes, switch lenses, trace a requirement, accept the ai's proposed changes and watch the tree update. Nothing here is a video.
Switch lenses
OARHVG
WorkspaceAutonomous Delivery Rover▾
Search commands⌘K
System tree
23 nodes
powerdatacontrolhover any edge to trace it
›Power
SubsystemSS.01derived · SYS.01
Power
Regulated 28.4 V bus. Battery, distribution, and charging. Isolation between motor and compute rails.
You just drove a structured engineering model — nodes, requirements, interfaces, verification, all traceable. That model is what you keep. Open the app and start one from your own rough idea.