This lesson dates from May 2026, when this site was designed as an illustrated 2.5D room with clickable stations. The room was retired in September 2026; the site is now a plain notebook with no room or hotspots.
On a desktop, the room could invite exploration: a pointer can find a small hotspot, and a large screen shows the whole scene. On a phone the same hotspots became small tap targets on a scaled-down picture. A phone layout has to respect thumbs, limited attention and short sessions.
So the room kept its identity on large screens without forcing the same interaction model onto every viewport. On small screens the stations became a clear list, with the same routes and the same content.
Same world, different controls.
What still applies
The rule outlived the room. The site’s working instructions still say that mobile must not force tiny hotspot tapping, and that content must be reachable as ordinary HTML rather than only through a visual scene. A phone layout should be designed for touch, not produced by shrinking the desktop one.