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Three Dialogues Between Hylas and Philonous in Opposition to the Sceptics and Atheists is the complete title of the work known as Three Dialogues, written by the Irish philosopher and Church of Ireland bishop George Berkeley. It is a groundbreaking philosophical work presented as a series of dialogues between two characters, Hylas and Philonous, where Berkeley critiques Then-prevalent materialist philosophy and posits his philosophy of immaterialism.