Arnhem Land x-ray bark painting is the Yolŋu and Kunwinjku tradition of painting ancestral figures — barramundi, fish, and creator beings — on sheets of dark eucalyptus stringybark, their bones and internal organs shown as if x-rayed. Its signature is *rarrk*: extremely fine cross-hatching laid with a human-hair *marwat* brush in prescribed clan colour sequences, producing a shimmering, vibrating brilliance.

This design system distills that tradition into a digital language — a warm red-brown bark ground that reads near-black in raking light, a fixed four-pigment ochre palette, and rarrk-textured surfaces where dense parallel lines do the work that gradients never should.