About five years ago, Apple design guru Jony Ive decided he wanted a new feature for the next MacBook: a small dot of green light above the screen, shining through the computer’s aluminum casing to indicate when its camera was on. The problem? It’s physically impossible to shine light through metal.
Ive called in a team of manufacturing and materials experts to figure out how to make the impossible possible, according to a former employee familiar with the development who requested anonymity to avoid irking Apple. The team discovered it could use a customized laser to poke holes in the aluminum small enough to be nearly invisible to the human eye but big enough to let light through.