Aside from that, you’ll simply be using the existing Automatically Change Desktop Picture feature of Mac OS that has been around since the earliest days of Mac OS X. For optimal effect you will want somewhere between 10 and 25 images that are of the same general scene or landscape.
If you’re creative with Pixelmator or Photoshop you can make them yourself, you can download collections of them found on the web (as we’ll do in this tutorial with images from Mojave default wallpaper), you create these yourself with Time Lapse photography on iPhone or iPad, or you can compile your own collection of images on your own – just make sure the pictures have file names that are labeled sequentially in the order of how you want them to show up (file1, file2, file3 etc).
To mimic Dynamic Desktops on any version of Mac OS, you will need a collection of wallpapers that are of the same scene but have different lighting or colors. Once you have downloaded the images from the link above on your Mac you can AirDrop them to your iPhone, copy them to an iCloud folder, iMessage them to yourself, or just view them here (via the Imgur app), and download the one you like onto your iPhone.But you actually don’t need macOS Mojave (whether in public beta or otherwise) to gain a Dynamic Desktop feature on the Mac, and you can accomplish a very similar effect by using existing features available to every version of Mac OS system software. Want to use Apple’s sand-dune image on your iPhone too?
If you install Mojave the Dynamic Desktop should be linked to the hours of daylight where you are based. Since there are only eight images that look sufficiently daytime that means you will only get that daylight effect for eight hours of the day, so choose wisely! The only issue with this method of creating a Dynamic Desktop is that here in the UK right now we’re in the height of summer, with long days (the sun was up at 4.45am this morning and will set at 9.20pm). If that method doesn’t display a daytime image when you want it to, try switching to Random images, and when you are satisfied that the image displayed fits the time of day, turn off the Random setting.
It is also possible to create a Dynamic Desktop style effect, we’ll look at how to do that next. If you would like to use one as your desktop wallpaper on a Mac, follow these instructions. There are a total of 16 images of the same sand-dune in the folder, each one representing a different time of day. This Reddit poster has uploaded all the images that combine to make the Dynamic Desktop image of the sand dune that Apple is using to represent Mojave.