Slides provide the ability to build a narrative into your projected AR experience.
Think of slides as separate compositions, which let you have different content on different slides. While your surfaces persist across slides to help you model the real world, your content can vary per slide — the same surface can have different content (effects, videos, or imported media) on different slides.
If you edit a surface's mask or structure on any slide, the edits apply to all other slides. Adding, removing, or editing the content of a surface only applies those changes to the current slide. This makes it easier to iteratively create content to match your scene.