A theory that cannot accommodate the sublime, the ugly, or the grotesque as legitimate visual categories—as Rosenkranz's 'Aesthetics of Ugliness' establishes—is systematically incomplete.

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Aesthetics of Ugliness(as a specific philosophical text): Rosenkranz's philosophical work that takes ugliness seriously as a legitimate and important subject for artistic study, rather than dismissing it.
Karl Rosenkranz(as a historical philosopher referenced): A 19th-century German philosopher who wrote 'Aesthetics of Ugliness,' arguing that ugliness deserves serious study as an important part of art and beauty, not just as the opposite of beauty.
Legitimate visual categories(as referring to recognized aspects of aesthetics): Types of visual experience or aesthetic feelings that deserve to be taken seriously and studied as valid subjects in art and beauty.
Systematically incomplete(as a fundamental limitation of schema-based methods): Lacking the ability to prove everything that should be provable within a logical system, due to structural limitations rather than minor gaps.

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