When I put my iphone under UV light at a store's display, I saw that the home button glowed [under the UV light] -- like those little stars I had (okay...still have) in my room to make it easier to fall asleep. Interesting optical property... EDIT: It does glow when a light is on it and it happens to be in the dark too I understand the criticism for the thread title and am sorry so many people got worked up about it -- missed out somewhere on the lingo. Just reporting an observation. But The interesting thing is that all the other surfaces on the phone are under the same light, yet there is a contrast. As coldplay would say: Lights will guide you home G.B.