Which philosopher is known for the idea that "to be is to be perceived"?

The idea that "to be is to be perceived" is attributed to George Berkeley, an influential philosopher in the 18th century who was a key figure in the development of idealism. This statement encapsulates Berkeley's theory that existence is dependent upon being perceived by a mind. In his view, physical objects do not exist independently of our perception; rather, their existence is fundamentally tied to being perceived by observers. Berkeley proposed that what we consider tangible reality is, in fact, a collection of ideas and experiences that rely on the act of perception. This notion challenges the materialist view that objects exist in a reality independent of our sensory experience, emphasizing the role of perception in the formation of our understanding of the world.