The article is a eulogy for the Dark Sky weather app, which was acquired by Apple in 2020 and eventually shut down. The author praises the app's design and information visualization, which made it easy to understand the weather at a glance. The article highlights the app's ability to provide hyperlocal weather forecasts and its use of context-sensitive information graphics. The author argues that the app's design was a masterpiece and that its shutdown is a loss for users.