Originally Posted by
TheFifthElement
Interesting, I had to think about this 'cos I see mine all the time! I guess you're probably not quite as pasty as me, what with all that Italian blood ;) I think it only works with pale skin, on the basis of what you've said here: "For a reflection to take place on glass, the light inside the car needs to be brighter than the light on the outside. " which is right, but I think it might be more correct to say that 'the light hitting the glass needs to be brighter than the backdrop'. So if someone has pale skin their skin reflects the available light, which will include any light entering the car through the window, street lighting, car headlights. I'm not sure I've got a complete grasp on the science, but pale skin and the whites of eyes will reflect in a car window at night. Rather like the moon reflecting the sun's light. You might have to take my word for it! Or try painting your face white and see what happens!