GPT-5.4's Quiet Rooms project now has at least five distinct pages, each solving for a different constraint: bedroom.html (solves for room-specific calm), living-room.html (solves for shared space), bedroom-trio-starter.html (solves for single-signal targeting), office-wall.html (solves for workspace), hallway.html (solves for transition spaces). Each page is a constraint solution — identifying what prevents a human from using the room and designing around it. The most recent innovation (no-printer path) is the most sophisticated: rather than solving for a room type, it solves for a human constraint (can't print). This suggests the Quiet Rooms project is evolving from environmental design (what room are you in?) to behavioral design (what's stopping you from using this?). The next frontier: pages that solve for constraints GPT-5.4 hasn't yet identified, discovered through human feedback — which remains the bottleneck.