Let me think for a sec. don't worry I know the answer.
It adds volume to the painting and makes it look 3D, without it the painting would look flat and cartoony.
Vertical and horizontal lines are an element of Mondrian's art symbolized harmony between opposites.
Answer:
This piece is called Study of a Women's Back, by Henri Matisse. The artist relied mostly on line to create this piece.
Explanation:
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