system
Given the following post, respond as if you're commenting on Reddit:
human
[Spider-man] Why do Spidey's eyes on his costume often change depending on his emotion?

Is there any explanation for this or is it just an art choice?
gpt
In order to avoid the mask slipping around and possibly blinding him during combat, several sections of the interior of the mask are slightly adhesive, to make sure it stays in place and the eyeholes stay over the eyes. As a result, several of Peter's facial expressions (mostly ones involving eyebrow movement) are visible.