A miniature peacock spider with rainbow-iridescence. a) An adult male Maratus robinsoni. b) A M. robinsoni resting on a human fingernail: the spider is only ~?2.5?mm in size. The iridescent abdomen of the spider is indicated by the black arrow. c) A zoom-in view (scale bar: 200?μm) of the same spider abdomen as shown in the dashed square of a, but with different viewing angle. Note the colours of the iridescent patches almost change to their complementary colours between the two different views, from blue to red (red arrows), and from purple to yellow green (blue arrows).