This is a special Wallpaper. With macOS Mojave, Apple has introduced two new time-shifting desktops that match the hour of the day wherever you are.
This is our new Dynamic Wallpaper that will change the appearance along with the system Theme from Light to Dark, automatically! Try it yourself on your Mac. You need macOS Mojave or higher.
Here's how the wallpaper looks like on an iPhone. This preview is powered by @ispazio, the creators of Wallpapers Central.