I work on many pieces of art at a time because I love to experiment with color combinations, materials, created collage elements, and as a way to use up extra paints and mediums. I also like to explore untried possibilities. What happens if I layer the magenta over the yellow? What would it look like if I reversed the order? Explorations and "making backgrounds" are fun and relaxing activities, but eventually you need to get down to the work of finding resolution in the piece and finishing it. Getting it matted or hung on the wall is also a big step...
