George Berkeley published 'A Treatise Concerning the Principles of Human Knowledge' in 1710, where he articulated his philosophy of subjective idealism, encapsulated in the phrase 'esse est percipi' (to be is to be perceived). Berkeley argued that material objects do not exist independently of our perceptions, challenging the prevailing materialist views of his time. His ideas contributed significantly to the fields of philosophy and epistemology, influencing later thinkers and debates on the nature of reality.

George Berkeley's 'A Treatise Concerning the Principles of Human Knowledge,' published in 1710, challenged the notion of objective reality, influencing the subjective landscapes of Romantic poetry. His ideas about perception and existence resonated with poets who sought to explore the inner workings of the mind and the nature of reality.