My understanding is that the Pink Palace IMAX theatre cannot accommodate full-length feature films due to size of the physical film reels. It can't be expanded because it was built underground.
This looks like a version of an international exit sign. You should check out a really interesting Slate article from March. It explains the "great debate".
By Hannah Sayle, Chris Herrington, Chris Shaw, Louis Goggans, Greg Akers and Bruce VanWyngarden
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