Philosophers like Kant denied any externality to space and viewed it as a necessary mode of objective perception, a special condition of the sensibility. Space, however, is not a creation of any individual mind, for all perceptions are contained in it, though it is possible for us to believe that space may be a mode of perception by a cosmic mind. In these days, there is a tendency to reduce perceptual space to certain kinds of relationship between bodies, to position, distance and direction. Even these relations are external, objective and real to all perceiving minds and are not the creations of any particular mind. Space, thus, becomes a cosmic factor necessary for the perception of things by all minds.
Time appears as an element very necessary in the understanding of any event completely.
It is not enough if we merely understand the three dimensions right and left, up and down, far and near related to an object or event. We also require to know, in addition to these factors, a fourth dimension succession in terms of before and after . Such temporal succession in space is called time, and due to the peculiar manner of the reaction of our minds to events that occur in space in what we call succession, we are made to create a distinction between past, present and future. The succession is really continuous, and no genuine demarcation can be made in it. But, on account of the play of our minds in the form of sense-perception, memory and imagination, such a threefold distinction is made in the passage of time.