Using a slide projector, I set the timer for 20 minutes and picked a slide at random. I have a 24 x 48 white canvas set up as a screen. Painting 3 or 4 small 4 x 6 inch studies from different slides, the purpose was to force myself to make quick decisions, without overthinking. In trying to move forward, sometimes figuring out how we're blocking our own progress becomes important. The timer is a terrific antidote to "overworking" a painting.