Isabelle put out a call for people to explain the image. Her personal theory involved a green screen.
Or maybe it was...
This woman had a theory that they took the photo and then printed it on a few textbooks for the students to hold — and then took another photo.
But people were very skeptical.
Some had dark theories about what was going on.
A guy said his entire class got into a debate about the book last year. Conclusion: Photoshop!
Right. In fact, a Reddit user found it a while back:
And if you look at the textbook version, the students' arms cover up where the textbook would have to be.
After being contacted by BuzzFeed News, the publisher of the textbook looked at Isabelle's tweet and said they are "absolutely overwhelmed" by the response on Twitter. The company also tweeted a reply: