Because I have been participating in several plein-air painting events over the past year, much of my current work is done outdoors and on a small scale. Still, it is rare for me to leave the alla prima layer alone and call a one-session painting finished; I will often let the initial layer dry and then return to the same spot on a day with similar weather, and adjust the large blocks of tone, usually lightening the sky and gradually lightening the shadows and finally purifying the lightest areas. I use a limited palette, usually three or four tubes per painting. Most of what I like as a painter comes from the way an under-layer interacts with the color on top. You get subtle color shifts, atmosphere, and space, all of which are compelling elements in painting.