Male jumping spiders of the Australian salticid genus Maratus have brightly coloured opisthosomal flaps that are raised and oscillated sideways during their courtship display. The prominent blue colour is due to pigmentless scales that have a structural colour created by an intricate photonic system. Photograph by Jürgen Otto. See D. G. Stavenga et al., Splendid coloration of the peacock spider Maratus splendens. J. R. Soc. Interface13: 20160437; http://dx.doi.org/10.1098/rsif.2016.0437.