: What is it with this grinning skull fetish that 343i artists have anyways?
: It's juvenile and banal to the extreme and has nothing to do with the
: Forerunners' established visual style. Hell, I wouldn't be surprised if
: Monitors and Sentinels were redesigned to have them sooner or later.

It also doesn't make much sense from an intimidation perspective. Most of their armed constructs that we see were built to fight the Flood, which wouldn't be frightened at all by a skull face.