iOS uses a parallax effect to create the perception of depth on your Home screen and other areas of your device. When parallax effect is on, you might notice:
- Screen zooms when you open folders or apps.
- Wallpaper icons and alerts shift slightly when you move your iPhone, iPad, or iPod touch.
- Photos or images you use as a wallpaper are slightly zoomed in or can't scale to fit the screen.
You might also see motion in apps like Weather and Messages. To reduce these types of movement, go to Settings > General > Accessibility > Reduce Motion and turn on Reduce Motion.