Many of the 2001 Noble Kanohi, and a few from 2008 (I’m sure there’re more, I just can’t think of them at the moment.), feature wires in a circuit-like pattern. Are these actual mechanical elements added on to serve a purpose, like scopes on certain masks, or simply a visual feature of the design (in-universe, I mean).
It may be worth noting that in Mask of Light masks with these features make them look like separate pieces.