This a video demonstration of a little app created by developer Robert McGregor that uses the iPhone X’s face-tracking system (specifically its eye-tracking) to create an onscreen ‘bottomless pit’ parallax effect. Apparently ‘TheParallaxView’ will be available in the App Store soon for those of you still looking for new ways to justify the $1,000 you spent on the phone. And what better way to do that than with a party trick? I don’t know about you, but whenever I see something like this it reminds me of an infinity mirror. I remember I once rented an apartment that had mirrored walls on both the front and rear of the shower and I would just stand there for hours pretending like I really did have a thousand penises. I miss that place.

Keep going for the whole video, including an explanation of how the app works.

Source: Geekologie – Guy Uses iPhone X’s Face-Tracking To Create Onscreen Bottomless Pit Parallax Effect