Berkeley’s Idealism
 Bishop George Berkeley is sometimes known as the "Father of Idealism", and he formulated one of the purest forms of Idealism in the early 18th Century.
 He argued that our knowledge must be based on our perceptions and that there was indeed no "real" knowable object behind one's perception (in effect, that what was "real" was the perception itself). He explained how it is that each of us apparently has much the same sort of perceptions of an object, by bringing in God as the immediate cause of all of our perceptions.
 Berkeley's version of Idealism is usually referred to as Subjective Idealism or Dogmatic Idealism.