I found this when I left work this afternoon. My best guess is it is the reflection of the neighboring car's hubcap after the sun angled through my windshield and illuminated it. I've never seen anything like it before though. And, no offense to my neighbor, but their wheel doesn't look clean or shiny enough to make such a vivid image... It is also not like my car to be involved in something so attractive on the ground. These days it usually just specializes in ugly puddles - coolant, power steering fluid, etc. It's a welcome change.... ;-)