I try to carry a small sketch pad whenever I travel or go out to dinner. I mainly draw people's faces. I have a few rules for how I choose whom to draw. They have to sitting relatively still. They have to be just far away enough so that they don't notice I'm drawing them. They have to have an interesting face. Since I don't wear bifocals, I can see the person I'm drawing, but the sketch pad is blurry. As a result, I don't know what the drawing really looks like until I'm done. Then I can take off my glasses to see the result.