David Sandum. Left: "Summer Evening," 2004. Right: "Spring Turn into Summer," 2016. Most people have never heard of gouache as a painting medium. I first learned about it in 2004 while reading a book about Chagall. Color has always been important to me, and I was amazed at the strong effects of gouache compared to the softer aquarelle/watercolor mediums.

I'd been looking for a fast way to paint on paper, so I immediately bought some gouache tubes at the art store and began experimenting....