It is on the repeated evidence of this fact--the discontinuity of immediate being, the inexplicable gulfs which separate its ordered provinces from one another, that we rise to the distinction of two orders or grades of being: a double aspect of reality. The primitive consciousness is, we may suppose, confined to one level of being, one world. And so long as the facts remain within limits there is no need to go further. The measure is the rule. But the uniformity breaks down abruptly[13]: the rule has its inevitable exceptions: it is no law or principle, but only the factual majority within a fixed range. Thus the measure, to fulfil all that is expected of it, and be a full expression or definition of reality, must go beyond a mere measure: must become the essence, or rather give place to the essence. In order to explain the irregularity and want of measure which turns up if we exceed the narrow provinces of being, we are forced on the conception of a being, one permanent and the same, set in relation, antithetical but inseparable, to an other being, manifold, changing, and different. The undying rhythm, the ceaseless symmetry retreat into the further region--the world beyond: while the older surface-being, as set against it, comes to be a mere phenomenon or appearance, a derivative and dependent something, which has its roots of being in the underlying law and essential reality. But the two planes are still in intimate connexion, in a correlation which becomes more and more palpable as its implications are disclosed and realised.