Define symmetry and proportion. Why are they important to artistic design?

Why are they important to artistic design? Symmetry is achieved when parts of an object are arranged along an imaginary center line. Proportion is the relation of one part to another, or of parts to the whole, in respect to size, height, width and scale. Symmetry provides balance and aesthetic appeal.

Explanation:

earliest

neumes above text

neumes

colored lines

neumes

4-line staff

f, c, or g clef

notes on 5-line staff with clef

mensuration (longas and breves)

time signature (perfect or half circle)

most recent

notes on 5-line staff

modern clefs

modern note values (whole, half, quarter, and so on)

modern time signature

italian words and abbreviations for dynamics and tempo

staccato, slurs, and so on