straight or curved a range of colors (black, white, blue, green, etc.) different thickness different lengths intersecting lines parallel lines a point of reference for judging the lines (e.g. another line or an object in the photo)
lines which has straight or curved lines which is a range of colors (black, white, blue, green, etc.) lines which has different thickness lines which has different lengths lines which has intersecting lines lines which has parallel lines lines which is a point of reference for judging the lines (e.g. another line or an object in the photo)