What Constitutes the "Heart" of a Work?

• The heart doctrine in substantial similarity tests hinges on subjective p perception and legal judgment.
• Defining what constitutes the central contribution is inherently ambiguou ambiguous and context-dependent.
• This ambiguity can lead to inconsistent outcomes across different courts  and cases.

This insight opens the question: How can objective criteria be establishe established to determine a work's "heart" in copyright infringement analyse analyses?