A new study published on Microsystems and Nanoengineering by Kazuhiro Kobayashi and Hiroaki Onoe details the development of a flexible and reflective multicolor display system that does not require continued energy supply for color retention. The idea aims to find futuristic applications with sustainable color displays and replace existing electronic display signs currently used for multicolor messages and images. While the concept originates from electronic paper or flexible electronics that look like print on paper (developed for smart wear), the proposed method simply relies on sequentially introduced colored water droplets and air pockets in a microfluidic device precisely fabricated on a flexible polymer to maintain stable bitmap images without energy consumption.