Shape is devoid of any definite edges but is enclosed within other shapes
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I believe the better answer is the circle.

Explanation:

Symbolically speaking, the circle is considered as the supreme sign of perfection, union, and fullness. The circle is also synonymous with movement, expansion, and time. It also represents the sky, the firmament, and the cosmic order in astrology. It also represents the activity and cyclical movements of the planets represented in the horoscopes and in the Zodiac, around the Sun.

the above mentioned statements talks about the creativity of an artist and to what extend they can utilize and experiment on the objects provided.   differing size and subjects are given so that an image of wisdom is created. displaying a transition from light to dark in something by darkening sections in order to create a shadow. and lastly, putting bits and pieces together to formulate a new image.

for those of you who searched "which list includes four types of animal-like protists? " and keep getting these results, the answer is c: flagellates, sarcodines, ciliates, parasites