Definition
George Berkeley, also known as Bishop Berkeley, was an Irish philosopher whose primary achievement was the advancement of a theory he called 'immaterialism.' Essentially, he believed that reality depends on being perceived. If something isn't perceived by a mind, it doesn't exist. 🤯 Imagine it like this: if your favorite game server suddenly disappeared when no one was logged in, that's kind of what Berkeley thought about the whole world! It's a mind-bending concept about existence.