Everybody say, "thank you, Mother Nature!"

Does art imitate life, or does life imitate art? Which came first, the chicken or the egg? Does this agate resemble Cookie Monster, or does Cookie Monster resemble this agate? Cookie Monster himself weighed in on Twitter.

While we may never have concrete answers to those philosophical questions, here's what we do know. This agate—a translucent variety of microcrystalline quartz—was discovered in November inside the volcanic rock in the Rio Grande do Sul region of Brazil by gemologist Lucas Fassari, and posted to Facebook by its current owner, geologist Mike Bowers. In the video, Bowers holds up what looks like a regular rock. When he splits the two sides apart, though, voila! Beloved Sesame Street character, Cookie Monster!

The story went viral when Dr. Jacqueline Antonovich, a professor at Muhlenberg College, tweeted

As Bowers told Kennedy News and Media, "I think this is probably the most perfect Cookie Monster out there … I have seen others but here you have it complete on both sides. This is very unusual. There are a few famous agates out there: the owl, the scared face. There are many approximate ones but it is rare to find one so well defined like this."

The grinning little geode is more than just a curio for Sesame Street fans, though. Thanks to its unique formation, the rock could be worth more than $10,000. Um ... be right back—looking for an Oscar the Grouch agate. 

What do you think? Have you ever seen anything like it? Let us know in the comments.