Zorander: The eyes narrow with suspicion when you speak, and no response is forthcoming. You advance slowly, and as you draw closer you see the slight hint of a ghostly face.
The face looks familiar... and it's...
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It's your own reflection on a glass display case.
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Once you go aroun the display case you find the staff-only door tucked inconspicuously behind it. You're in the SE part of Exhibit 3.
((anyone can look at these spoilers. I just do it for effect. If you're in the same area and doing the same general thing, you can get the same information - I'll specify if a spoiler is meant for select people only.))