Immanuel Kant considers whether space and time are a priori or a posteriori, involved in the nature of the knowing subject as indispensable conditions of consciousness or the result of impressions made on the subject from without. He points out the all explanations of space and time from experience are worthless, for space and time are logically prior to experience. Kant contends the ideas of space and time from which mathematics are derived must necessarily be perceptions. In Transcendental aesthetic he is dealing with sensibility, and seeking to discover it’s a priori conditions. The transcendental exposition of space and time Kant is proving his conclusion arrived at in the metaphysical exposition. A priori space and time perception gives universal and necessary truth; independent of the sensation given in each particular experience, it enables all minds to anticipate the form of experience in similar fashion and with apodeictic certainty.