I found Union Pacific steam locomotive 4014 lubrication grease stains on the asphalt.

The lubrication grease, combined with hot water, makes this beautiful rainbow image on the asphalt. Similar to many artists that I know, I tend to seek out beauty in unexpected places.

Here is one more unintended and spontaneous rainbow image created by grease and hot water that most people would overlook, as their attention is focused on UP 4014.