Background or empty space structure space surrounding shapes and forms in a art work is

Negative Space - the empty space between the shapes or forms 3- D Space can be defined as the space over, under, through, behind, and around a form. Architecture, sculpture, weaving, ceramics, and jewelry are three-dimensional art forms 2-D space can best be described as an illusion.

Explanation:

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pitch- the definition of pitch is as follows:

"the quality of a sound governed by the rate of vibrations producing it; the degree of highness or lowness of a tone."