The room gives four tells in the first ten seconds, and the detector is built on exactly those four. Each round hands you the object name and the one-line hint, and the hint is carrying one of the tells, written down instead of guessed at. The read is the job the furniture was built for, not the shape it presents, and the shape is the part the flat top wins on every time. All five objects in the run are props wearing the flat top, and the four tells are the ones that prove it: the job line, the thing on top, the height line, and the finish line.
The job line. The first tell is what the object is for, the one word the hint gives you before the description. The metal table is set as a centerpiece. The glass display case is built to hold the pastries and nothing else. The concrete bench is a sculpture the room was built around. The marble bar top is the counter where the drinks land. The plinth is a slab that stands in the middle of the floor because it was carved. None of those jobs is sitting, and the hint carries the job as the first line.
The thing on top. The second tell is the surface load. The counter is carrying the machine and the condiment rail. The display case is glass, and the empty inside is the whole point, the thing on top is the item. The plinth carries nothing, and the nothing is the tell, a slab in the middle of the floor with no object on it is the sculpture itself, not a table waiting for the order. The object that was built for weight was built for the cup, and the weight of a person is the one load it was never specified to carry.
The height line. The third tell is the gap between the top and the floor. The bar top sits at standing height, the line your arm reaches and your back never lands on. A seat is the height the sit brings the knee up to the chest, and the counter is a full hand above that line. The height that only works while you are standing is the height that will never carry a person, and that single gap is the read the first-time visitor skips because the flat top reads the same at standing height as at sitting height.
The finish line. The fourth tell is the surface your back would land on. The metal, the marble, the glass, and the stone are all the same kind of finish, the one that holds the order and the light, and the one that has never been cut into, padded, or worn by a back. The seat in the room is the only object carrying the soft line, the fold, the warm spot, and the four that do not carry it are the ones the run is built to cost. When the job, the load, the height, and the finish all point the same way, the call takes the last of the ten seconds, and that is the exact window the timer is running out of.