Question

he used
shapes and colors.
principles of design variety contrasting unity
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and he used repeated shapes and colors to create
principles of design variety contrasting unity
check answer

Explanation:

For the first blank: "contrasting" describes shapes and colors that differ to create visual interest, fitting the context of using such shapes/colors. For the second blank: "unity" is achieved by repeating shapes and colors to create a cohesive feel in design.

Answer:

First blank: contrasting
Second blank: unity