1. Everyone knows what a line is. We use it everyday, you're looking at several lines right now as you read this questionnaire, how would you define it? a. Refers to the surface appearance which is either rough or smooth, dull or glossy, thick or thin. b. The skeleton or basic foundation sketch to direct the eye vertically or horizontally. c. Pertains to the relationship in size between a part and the whole. d. This can be cool, warm, bright or dull. inloc of docian that relate to each other What is similar about these principles?