The act of repeating a shape, object, color, or line is called . form
intensity
proportion
repetition

Repetition!

Explanation:

Whenever you use anything in your art piece more than twice, it's considered repetition, and can make your work more interesting or fun to look at.

I hope this helps!

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