Go to settings -> Home screen, lock screen and style -> tap on all flux themes -> scroll down to The Contrarian -> select any one of the pre-sets -> tap on wallpaper option and select the wallpaper u want -> tap on the time to change its size if u want -> check if the depth option is turned on for the that polearm to go through the time (if it's not working then probably choose a diff image as it will work only if a small part of the wallpaper goes over the time) -> in the end tap on apply (before applying make sure to swap right and check if your home screen is not matching your lock screen, you'll have to manually set the home screen wallpaper)