Transparent dichroic film. The reflected colours depend on the viewing angle. It is constructed from multiple layers of incredibly thin, vacuum deposition coating. Based on transparent polyester (PET) film, each layer reflects some of the light, causing light interference, which results in iridescent, shifting colour.

Dichroic film produces a myriad of reflected colours depending on the viewing angle. It is constructed from multiple layers of incredibly thin, vacuum deposition coating. This example is polyvinyl chloride (PVC) film with a black underside.

Lightfalls by Todd Bracher Studio for 3M. A moulded acrylic light reflector covers a single LED bulb. To create the coloured effects, 3M dichroic film (vacuum deposition coated polyester film) is placed over the light source. Image Todd Bracher Studio.

Lotus Elise S1 Chassis, launched 1995, manufactured by Hydro Aluminium from extruded 6063 and bent sheet 3105 aluminium alloy, riveted and bonded with 3M epoxy adhesive. The two-part adhesive is post-cured for enhanced strength. The bare chassis weighs just 68 kg.