It isn't just math problems [1] confusing the internet — now it's actual math textbooks. This College Prep Algebra textbook, specifically, is about to send you into a spiraling dark hole of confusion. It all began with this tweet on Friday:

how the fuck are they already on the textbook if theyre posing for it pic.twitter.com/fkpP9HTWnk [2]

— ️ (@riarklerise) May 19, 2016 [3]

What is this sorcery?

@riarklerise [4] pic.twitter.com/VPYRqplQ7E [5]

— Mმƙმνεlἶ ჯ Kεყყყყყʂ (@_KeyysxMakaveli) May 20, 2016 [6]

Obviously, it's time travel.

@riarklerise [7] @andrewpfister [8] I don't think they cover the time travelers paradox until Algebra II

— Corey Garnett (@CoreyGarnett) May 20, 2016 [9]

OR Photoshop. (But probably time travel.)

@riarklerise [10] @BobbyBigWheel [11] Time travel! No, wait. Photoshop.

— David (@RedRocks_76) May 20, 2016 [12]

OK fine, it's actually Photoshop. This cover inception was first uncovered on Reddit [13] two years ago, and an internet sleuth found the original stock photo [14] used for the cover. And if you REALLY want to go down the rabbit hole, here's one of the models posing with the book cover of himself on the book cover:

View post on imgur.com [15]

Mystery solved. Or is it . . .

Image Source: MGM [16]