If different values are applied to the three visible faces of a cube, what effect is created?

Correct answer: A three-dimensional effect

D is correct. In art, value means how light or dark a colour or tone is. Giving the cube’s faces different values suggests light and shade and makes its separate planes easier to see. This helps a flat drawing look solid and three-dimensional. Value is about lightness and darkness, not about creating a border or choosing warm colours.