(vpow .(dot ..(rgb-from-hsl ...(vmax ....(sigmoid .....(vcos ......(lightness-from-rgb .......(sigmoid -0.4808)))) ....(checker .....(rgb-from-hsl 0.8314) [-1.4667 1.1261]))) pos) .(height ..(theta ...(min-component ....(min-component .....(t pos))))))