...when you run your own probably-boring digital pictures of neighborhood sights through the sketch designer to see if it comes up with anything interesting which you could maybe use as a portrait background or maybe a t-shirt texture in Poser or maybe it would be 20 minutes of render time for something not worth saving and you're actually evaluating whether or not the next 20 minutes are expendable towards this venture in "Pastel/Render Against Black" mode, or whatever...