Hover a domain to flood it and read the panel below. Hover an overlap to name it. Click to filter, click again to fire onEnter (wired to console.log by default). The dust motes drift on their own, bounce off the dashed off-the-record set, and flee your cursor before settling back. Everything below the diagram — labels, colors, copy, physics, even the number of circles — is live-editable. Export your version as JSON to keep or share it.