http://www.techradar.com/news/ar-stickers-on-the-google-pixel-2-make-android-oreo-even-sweeter

Barring a few post-launch problems, it’s difficult to imagine ways in which the Pixel 2 and Pixel 2 XL could get much better. But leave it to Google to one-up itself. 

AR (augmented reality) Stickers are the best part of Android Oreo 8.1, the latest update to hit your Pixel phone (if not already, then very soon). Why? Well, they’re pure fun.