Final answer:
Value in the visual arts is measured on a scale from black to white, using varying shades of grey to indicate different levels of lightness or darkness.
Step-by-step explanation:
Value is measured on a scale from black to white, with varying shades of grey in between, indicating the relative lightness or darkness of a color or shape. This helps artists to create depth and dimension in their work by applying different tones and values. For instance, the lighter values near white are called high-keyed, and the darker values near black are called low-keyed. This value scale is crucial in the visual arts for representing contrast and for enhancing the three-dimensional illusion on a flat surface.