No quote to go with this, just one of the most extraordinary things I’ve ever seen.  This artist was sitting next to the glass of the expansive orangutan habitat.  She was sketching these two orangutans, who were sitting, and watching her intently.  Every once in a while, she would hold up her pad of paper to show them her progress, and then return to sketching.  They would study her drawing, and then go back to sitting quietly and continue to watch her sketch.  This went on for at least 45 minutes.