The hallway of the Seattle hotel at which we stayed.
The possibilities are:
- Someone over-ordered exit signs and green signs are very hard to return
- Green is the colour of the Emerald City so half of them were put at Munchkin eye level
- The lower ones are for cases where you have to crawl under the smoke.
- That's oddly specific, as if they have learned from their mistakes. I'm no longer comfortable staying at this hotel