this bmw changes colour! it's a colour—changing car! and to do so, it uses e—ink, the same as an e—reader. we have here is the world's first real colour—changing car. the technology e—ink is amazing. we know it from the e—readers, from the kindles, it's very low energy, it's sunlight readable and it's just colour change, there's no light, there's no leds, there's no backlight there's no oleds, it isjust colour change. so you just need a little bit of energy to change colour and absolutely no energy to hold it. so it's bi—stable and, as an engineer, that's a wonderful property to have. the driver can manually choose to change colour or you can do it via the sensors that are embedded in the vehicle. so you can have a temperature sensor, that when it's hot, the car will be white, and when it's cold, it'll be black, or you can have a light sensor so it changes colour at night time. so, there could be an actual purpose, apart from driving around wrapped in a copy of war and peace.