Ret_Mesh.0   This simplified model of a dynamic, color sensitive retina includes an irregular hexagonal mosaic of L and M cones, a resistive mesh model of horizontal (H) cell activity, bipolar cells that take the difference between the cone and H-cell signals and retinal ganglion cells (RGCs) that turn the bipolar signal into a spiking output. Some results from this model were reported in Huang and Bair (2009).