Why this exists
This is a public creative engine on the artifact plane, not just a static demo. Drop in an MP4, audio track, or supporting image and the experience reconfigures itself around your media.
When the result feels right, save it as a new IterFact. The uploaded file stays attached to the saved artifact so it reopens with your media already in place.
It is the clearest early proof that iterFact can host a free public engine, let people create with it directly, and turn that interaction into a durable artifact they can keep using later.