 The first major philosopher actually to call himself an idealist was Immanuel Kant (1724–1804), although as soon as he did so he labored to distinguish his position from Berkeley’s by calling his position empirical realism combined with transcendental idealism, by which he means that space and time are ineliminable properties of our experience and of things as they appear to us but not real properties of things as they are in themselves. However, since Kant neither denies the existence of things independent from our representations of them nor asserts that these things must be mental in nature, the transcendental idealist part of his position cannot be straightforwardly identified with idealism as he understood it or as we are understanding it here, namely, as the position that reality is ultimately mental in nature. While Kant thinks that he has given a sound argument for the transcendental ideality of space and time, he thinks he has given no reason at all to question the existence of things independent from our representations of them.