Eye part mask of Spider-Man and Deadpool
A mask or helmet or any such wearables is mostly used for protecting one's head from injury or in this case protects one's identity. But for Spider-Man as depicted in Captain America: Civil War and Deadpool the eye part in the mask actually seems to move according to the eyes.
Why does the eye part of the mask move and how? Isn't a mask kinda fixed stitched material? How does it track the eye reaction which the hero makes inside the mask?
Best Answer
While we do not know exactly HOW does the eyes of the Spider-man suit in Civil War move according to Peter Parker's own eyes, we definitely know WHY.
When Tony Stark goes recruiting the young Peter Parker, he notices Peter's self made costume, with ridiculous goggles. Peter specifically says that he cannot focus on his vision correctly without the goggles, because he cannot handle all of his super-senses at once (yet ?).
Part of Tony Stark's plan was to bribe Parker by offering him a high-tech costume, which would correct the goggles problem by adding some tech (and CGI) to the mask. Indeed, when Spider-man steals Captain's shield, his eyes get smaller and you hear kind of a mechanical sound.
For Deadpool, however, I'm fairly certain no tech was ever mentioned as to why his eyes move. So here's my answer : To make the character more expressive :p
Expressions were added on the mask with CGI in post-production to make him more charismatic, that's all.
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How does Deadpools mask eyes move?
The answer was the visual equivalent of dubbing. Each scene in which Deadpool talks was filmed twice, once with Reynolds wearing the mask and once without. Then, frame by frame, WETA Digital copied his facial movements onto the mask, in some places "enhancing it even more to hit specific Deadpool looks," says Rothbart.Deadpool and Spider-Man: Civil War
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Answer 2
To give a faceless character a face with emotions and reactions to what is going on around them. People need to connect with a character and it is hard to do so when they have no expression. It feels odd to the audience so they add the expressive eyes and the audience once again connects with the character.
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