Designed by Philips alongside Stella, a project that is developing flexible electronic substrates for the medical world, Skintile jewellery is an adhesive body adornment that can light up depending on your mood. Everything is contained in the substrate—energy supply, sensors, actuators and display, and Philips rather saucily claims that it is “arousal enhancing.” Well, I guess if you wind the design below round your erect penis to signal that you’ve got a hard-on, then yes, I guess it is.