How to use Google's mega-hit viral app, which compares your selfies to famous works of art

From Facebook to Instagram to Twitter, my social media feeds of late are flooded with selfies next to famous artwork.

Moreover, the selfies are seemingly parallel in nature to the artwork. 

You probably know what I'm talking about. These things:

As it turns out, all those photos are from a Google app that's over a year old: It's called the Google Arts & Culture app, and it's free on Google Play and the Apple App Store. 

The ability to compare your face to famous works of art, however, is a new feature. And it's one that's clearly caught on! You may be wondering how to use it - I'm here to help with that.