Check out our new preprint "First-order visual interneurons distribute distinct contrast and luminance information across ON and OFF pathways to achieve stable behavior". This collaborative work by Madhura, Burak and Sebastian explores luminance invariance in the Drosophila ON pathway and redefines the input architecture to fly visual circuitry: The first order interneurons L1, L2 and L3 are not pathway specific but all distribute distinct types of information to both ON and OFF pathways.