Turmite (Spiral Growth)

A Turmite is a generalized 2D Turing machine, similar to Langton's Ant, but with an internal state as well as a color on the grid.
Depending on the current color of the cell and its internal state, the Turmite (@) decides to turn, change the cell's color, and change its own internal state.
This specific configuration produces a complex, beautifully patterned expanding spiral. It demonstrates how highly structured, algorithmic behavior emerges from completely deterministic local rules.