3M scientists have been studying Blue Morpho butterfly wings in hopes of creating a glass film technology that could produce the same kind of color-shifting effect. A shimmering metallic is seen on the wings thanks to layers of microscopic scales that appear to change color depending on how the light hits them. Borrowing the same concept, the developers combined layers in an attempt to get a similar result. The film brings rainbows of colors that change and glimmer depending on where they are viewed.