I was a student of Richard Hull (Illustrator) for several years. He did a demo with acrylics and palette knife in class one day and he whipped it out rather quickly. I'm pretty sure he was going to throw it away but I asked if I could have it. (Isn't that clever of me.) He obliged and signed it for me as well. Just read here that he will be retiring next year from teaching after 23 years. Wow. Put he isn't putting down his paintbrush. Seems he might be on to bigger fish.