To spice up the AR gallery a little bit, it would be great to be able to add some new artwork to the environment. Using ARKit, doing this becomes relatively simple. There are a couple of gotchas to take into account when implementing a feature such as this, but overall Apple did a great job making ARKit an accessible platform to work with for developers.
When a user taps on one of the images in the collection view at the bottom of the screen, the image they tapped should be added to the environment. If possible, the image should be attached to one of the walls surrounding the user. If this isn't possible, the image should still be added, except it will float in the middle of the space.
To build this feature, ...