Art which stresses this type of line is said to be more formal and linear. There is subjective line or implied line which are lines of movement or direction in a work. These lines are compositional and direct the gaze of the viewer around the painting. Areas that have height and width, but lack depth. Shape is flat.
Shape can be either positive or negative.
Generally the shape of an object is the positive while the space around it can be termed the negative space. Mass has or depicts height, width and depth. Space and shape can either be positive or negative. Space in 2-dimensional work is depicted. The picture plane is the 2-dimensional surface on which the artist works.