If there is one thing that Rome and Barcelona share, it is the possibility of observing a sky that at certain times of the year offers us the spectacle of the collective movement of starlings. The science of complexity has marvelled at these bands and has devised systems to study them. You will be able to analyse the views of a photographer fascinated by these movements and who has also devised a technique for capturing them in an image, and that of a scientist who uses technology to capture the patterns of movement with ideas from the science of complexity.