Plato's writings on art, particularly in his dialogues The Republic and Symposium, laid the foundation for much of Western art theory.

Aristotle argued that art is essentially an imitation (mimesis) of nature, and that its purpose is to provide pleasure and instruction.

Plotinus's theory of beauty, as expounded in his Enneads, posits that beauty is an emanation from the One, the ultimate source of all reality.

Augustine's writings on art, particularly his treatise On Christian Doctrine, focus on the role of art in Christian worship and the importance of avoiding idolatry.

Giorgio Vasari's Lives of the Artists (1550) is widely regarded as the first comprehensive history of art, and it laid the foundation for modern art theory.

Kant's theory of aesthetics, as expounded in his Critique of Judgment, focuses on the concept of the sublime, which he defines as a feeling of awe and wonder in the face of the vast and powerful.

Theophile Gautier's theory of l'art pour l'art, which emphasizes the autonomy of art and its freedom from moral or didactic purposes, was influential in the development of modernism.

Greenberg's essay argues that the defining characteristic of modernist painting is its emphasis on flatness, as opposed to the illusion of depth.

Michel Foucault's theory of the gaze, as developed in his book Discipline and Punish, explores the power dynamics inherent in the act of looking.

Danto's institutional theory of art argues that art is defined by its institutional context, rather than by any inherent qualities of the artwork itself.

Donna Haraway's work on the posthuman and the Anthropocene explores the ways in which art and technology are transforming our understanding of the human and the natural world.

Boris Groys' theory of art focuses on the complex and often contradictory relationship between art and politics, particularly in the context of globalization and the rise of neoliberalism.

Pierre Bourdieu's theory of the "social life of art" explores the ways in which art is produced, circulated, and consumed within social and cultural contexts.

Jacques Rancière's theory of aesthetics, as developed in his book The Politics of Aesthetics, focuses on the distribution of the sensible, or the ways in which the world is made visible and intelligible through aesthetic practices.

Sara Ahmed's work on affect and the body explores the ways in which emotions and bodily experiences shape our understanding of the world and our relationships with others.