The whole design is about representing Garriya’s (rainbow serpent from the dreaming) path across the landscape creating the rivers, waterholes and springs (underground water sources).
This design is based on dhuru (snake) scales. Repeating the shape, I made sure that both the thickness of the line and the shape was altered in proportion each time and worked on the angles of overlap and radiation out form the centre. This is what gives the optical illusion.