Vermilion Cliffs, northern Arizona. At sunset the cliffs light up like flames. I got started and was thinking, you know what would be great here is a foreground shadow. And just then the world turned enough that the cliffs behind me cast a racing shadow that zipped right up to the foot of the cliffs I was painting. Thank you, Nature. Block in the upper left is from the clamp used to hold the panel to the box. Has one of my most successful tiny signatures ever.