#129Dichroic Glass

Dichroic glass that flips between cyan and amber depending on the angle you catch it at. A slowly rotating directional gradient plus a radial term stands in for the view angle, driving a Fresnel-shaped swap between the two coatings — mixed in Oklab so the transition passes through clean turquoise and gold rather than muddy grey. A second, counter-rotating reflection layer and a dark internal substrate give the pane real depth, and a thin thin-film seam catches the boundary as it slides across.