Big and small: RUSH image of the brain of a live mouse. The coloured lines show the motions of labelled immune cells. The image is about 1 cm across. (Courtesy: Jingtao Fan et al/Nature Photonics) A ...

With a great variety of shapes and sizes, compound eye morphologies give insight into visual ecology, development, and evolution, and inspire novel engineering. In contrast to our own camera-type eyes ...