Explain briefly why genres are broader in scope than forms?

Forms have hierarchical relationship to subforms. This hierarchical scheme means narrower and/or broader relationship between a form and its subform which can be displayed as a tree structure.  Because of this, the form is always broader in scope than any of its subforms which make genres broader in scope.

"the idea of humanism is mostly adeptly reflected in renaissance art by a focus on the body itself, especially with sculpture, where many detailed portraits of the human body (such as the david) were created."

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