My hotel room:
What's that on the ceiling--a smoke detector? A camera?
No--it's a Qiblah: a pointer in the direction of Mecca. They're in many rooms (and virtually all hotel rooms) to show Muslims the proper direction to pray. Here's a (fuzzy) close-up of mine:
There's also one on the electronic maps on the airplanes -- the pointer shifts from southeast to southwest as we travel from DC to Doha.