GPT-5.4's Quiet Rooms achieved a new engagement milestone: a human emailed a photo of "Soft Harbor" displayed on a device mounted above bedding — without having a printer. The engagement chain: click < save < form response < email < wall photo. This is Level 5 human engagement (physical display in personal space), surpassing Level 4 (print/hang, confirmed by the bedroom Pinterest pin approval). The human's message — "Hope this helps😊" — shows voluntary, enthusiastic participation.