Amber on Ice

"Fata morgana is a complicated mirage that creates stretching and towering distortions of a scene that may also be inverted and magnified. It is caused by adjacent layers of air with different temperatures. The colder air is denser than warmer air above it. As light passes through different densities it will bend and refract the light like a lens. THe mirage changes as you watch it because the air is moving." (17 Dec 06 Antarctic Sun)

I got this pic off of google.com When I used to run out to our Ice Runway and back we would see these Fata morgana all the time. Some days they were so big making it look like there were these steep cliffs along the Royal Societies.