Random Art in WebGL

Please read this page here if you're new to random art. This toy differs from that description, in that (const), doesn't use 4 channels (ARGB) but only three (RGB). E.g. (const 1 0.75 -0.4 0.9) is not valid but (const 0.75 -0.4 0.9) is. And compared to the original Python implementation (mix)'s weight parameter (the first one) does work.

If you don't what to do, I suggest setting K to somewhere between 2 and 5, and pressing the "Generate Random" button a few time; You'll start to spot the patterns of how the language works.

Grammar:

Numbers:
R, G, B → [-1, 1]
f → [any valid real number]

Terminals:
N → (const R G B)
N → (var x)
N → (var y)

Non-Terminals:
N → (sum N N)
N → (mul N N)
N → (mod N N)
N → (sin f f N)
N → (level f N N N)
N → (mix N N N)
N → (tent N)
N → (well N)