User blog comment:RaijinRising/RWBY's Visual Evolution Part 3 - Color (video is live)/@comment-25337617-20191006063938/@comment-24032889-20191007001405

So, basically, between Volumes 1 and 2, the city of Vale was completely redesigned. It was very colorful and had buildings of all sorts of material, whereas Volume 2 Vale was made of mostly grays, and the buildings were shaped very similarly.