I came to realize that perhaps the most distancing (and sometimes disturbing) aspect of masks is those empty eyes--it's more than the fact that a particular identity is hidden. The blankness is fundamentally disturbing, even though we may be able to feel the character or emotion inscribed by a good mask maker, and even though the blank eyes allow us to project something archetypal.
Here are a few examples of empty eyes (remember to click on the images for a fuller view):