First, some pictures: 

![one](https://i.imgur.com/MriNQ.jpg)

![two](https://i.imgur.com/G3Qpy.jpg).

I can replace the bulbs in the rest of my apartment just fine but the ones in the bathroom have a special enclosure around them that I don't know how to open. The only logical place to open the enclosure seems to be the chrome ring at the bottom but I've had no success trying to pull and/or twist it.