Regardless of your take on this year’s ultra-successful anti-superhero movie Deadpool, there’s no mistaking that there was a seriously high level of special effects artistry at play in between all the potty-mouthed humor and outrageous action.

In fact, first-time director Tim Miller’s background is in visual effects, so you know everyone on the crew on the relatively low budget movie had to be on the top of their game. And while the film is full of cleverly hidden CGI, there are also a number of downright wondrous practical effects. Case in point: the seamless creation of the now iconic mask worn by Merc with a Mouth.

Deadpool’s character has to emote without the ability for the audience to see his mouth or eyes, and he also has to come to life via a believable performance by actor Ryan Reynolds. These were some of the challenges faced by the FX artists behind the mask, and a new featurette that debuted on IGN, that will also be found on the Deadpool home video release, shows us how it was done.

The clip keys in on how the production managed to make a functional mask for Reynolds and for the movie itself. It’s great to see a concept come together perfectly practically and digitally. But the best part is the look at the magnetic eye plates that show the subtle changes used in the mask design that could pop in and out as needed. You’ll never look at Deadpool the same way again.

Just in case you didnt know, here’s the official synopsis:

“Based upon Marvel Comics’ most unconventional anti-hero, Deadpool tells the origin story of former Special Forces operative turned mercenary Wade Wilson, who after being subjected to a rogue experiment that leaves him with accelerated healing powers, adopts the alter ego Deadpool. Armed with his new abilities and a dark, twisted sense of humor, Deadpool hunts down the man who nearly destroyed his life.”

If you haven’t scooped up the digital version already, you can get yourself a hard copy when the Deadpool Blu-ray hits store shelves on May 10.