An experiment originally designed to test the visual abilities of octopuses and cuttlefish has given University of Bristol researchers an unprecedented insight into the human ability to perceive polarized light – the super sense that most of us don’t even know we have. We are all familiar with colour and brightness, but there is a third property of light, the ‘polarization’, which tells us the orientation in which the light waves are oscillating. Dr Shelby Temple, a Research Associate from the Ecology of Vision Group in Bristol’s School of Biological Sciences and one of the study’s lead authors said: “Imagine a skipping rope represents a light wave travelling through space.  If you move the rope from side to side, the wave you make is horizontally polarized.  If you shake the rope up and down you create a vertically polarized wave. Generally, light is a mixture of polarizations, but sometimes – for example in parts of the sky, on your computer screen and in reflections from water or glass – a large percentage of the waves are oscillating in the same orientation and the light is strongly polarized.”