How is value used to create the illusion of 3d space on a flat 2d surface

By adding value it creates a sense of depth, because you are adding multiple shades of a certain color and putting them on top of one another.  If you look at things from life you will notice that these things are not just one shade, but rather multiple colors put together to create the idea of form. Value adds form and depth into a seemingly flat surface, making it look like its coming off the page.

Hey there! the correct answer to your question is "artists were highly valued members of society."in the neothletic period, art flourished because artists were highly valued members of society. art was very valuable and still is. art grew because of known  artists and their great art works.hope this you.have a great day!