We were in the traffic line waiting to enter Yosemite park and I did a drawing of this rock outcropping with trees at the side of the road. This watercolor was done from that drawing. Many have made note of the little spots of blue and other colors in my paintings. I have given an explanation of these in my blog at www.carlpurcell.com. The post is in "Painting Tips" and is called "Seeing is Believing". Feel free to leave a comment. I'd like to discuss this with you.It is based on observation.