The zaZen's transparent roof structure is made from an advanced polycarbonate similar to that used for radio-controlled cars, which is both far lighter than glass and can be moulded into more intricate shapes. High-level brake lamp duties are handled by a hologram. The car's bodywork is finished in what Rinspeed describes as 'crystal skin' and it is literally that - thousands of tiny Swarovski crystals embedded in a mirror-smooth sealant.