The numbers behind good rooms.
Eighty measured rules from three teachers: Daniel Titchener, Bai Xu and Five By Nine. The walkway you turn sideways in. The art hung too high. The bulb that turned your living room into a supermarket. Learn the numbers, or describe a room that bothers you and the machine names the rules at work.
A learning tool, not a building code. Where the teachers disagree, the card shows both sides rather than picking one. Diagnose mode sends your text to an AI model to generate the reading; nothing is stored on this site's server. Every card names the teacher it came from.
80 rules from Daniel Titchener, Bai Xu and Five By Nine.
Describe a room that bothers you. What is in it, what it is used for, what feels off.
Guidance, not a building regulation. Tap a card for the full rule and the teacher behind it. For anything structural, a qualified human beats a card deck.
