The degree of lightness darkness of a matriel is called a blank

The degree of lightness and darkness of a material is called its value.

Explanation:

This is an important tool for designers / artists in a way to define forms and create fantasies of space. The value contrast separates the objects in space, and the gradation of values indicates the mass and contour of the continuous surface.

answer; 10 foot-candles

answer; i believe the correct answer is in new york,in subway stations,public murals and night clubs;