_Poseidon swirled his ambrosia for a while, contemplating the vastness of his watery dominion; putting down his chalice on the coaster, he noticed how most fitting its pattern was for a new maze with elegant coral, rivaling those conceited landstriders in Knossos._ This design results from a reaction-diffusion simulation using the Gray-Scott model. Reaction-diffusion systems can model pattern formations ubiquitous in nature, such as corals, dunes, or spots and stripes on animals. The simulation models a process whereby two chemicals react with each other and diffuse through a medium. The pattern is a visualization of the concentration of one of the chemicals across space at a specific point in time. The coaster measures 92 x 92 mm.