They depicted the figure mainly by observing human anatomy and having their model stand for them for hours for perfectly depict it.
Sculpture is art that's three dimensional it is made by joining pieces of material together. Carving is an example of making a sculpture using a solid block of material like stone or wood. Another one is modeling it is a sculpture that is created by adding pliable material to create a form usually with clay or sometimes wax. And a third one is Assembly that’s where people use pre made objects or objects that are found like large pieces of metals and put them together.
I hope this helps you out :)
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