Late in the spring of 2016 Facebook’s category-leading photo-sharing application, Instagram, abandoned its original icon, a retro camera familiar to the app’s 400- million-plus users, and replaced it with a flat modernist design that, as the head of design explained, “suggests a camera.” At a time when Instagram was under a growing threat from its rival Snapchat, he offered this rationale for the switch: The icon “was beginning to feel…not reflective of the community, and we thought we could make it better.”

A version of this article appeared in the January–February 2017 issue of Harvard Business Review.