Such, then, are the fundamental characteristics of the interior of Gothic churches. We must not look here for any definite purpose as such, but rather an object for the private devotion of the soul in its self-absorption in every detail of the spiritual life[106], and its elevation over all that is isolated and finite. For this reason these buildings are cut off from Nature by spaces enclosed on all sides, built up in the atmosphere of gloom and at the same time to the smallest detail in a spirit that strives upwards sublime and immeasurable. (_β_) If we direct our attention now to the _external_ aspect we shall find, as we have already above observed, that in contrast to the Greek temple the exterior configuration in Gothic architecture, the decoration and co-ordination of the walls and all else is determined from within outwards, the exterior having to appear simply as an enclosure of the interior. In this connection we have good reason to emphasize the following points: (_αα_) In the _first_ place in the form of the _cross_ which we find dominates the whole exterior we cannot fail to recognize in outline a similar construction as that which obtains within, a form which cuts, the nave and choir in two, and supplies, moreover, the distinctions of height which obtain between the aisles, the nave and choir. On closer inspection we find that the _principal façade_, as the external form of the aisles and nave, corresponds in the _portals_ to the particular construction within. A more lofty principal door, by which we pass direct into the nave, stands between the smaller entrances into the aisles, and suggests by means of the contraction in perspective that the exterior must draw together, grow more narrow, and disappear in order than an entrance may be thereby provided. The interior is the background already visible, into the depths of which the exterior is carried, just as the soul is constrained to grow more profound as ideality when it enters its own intrinsic wealth. Over the doors at the sides extend in the most direct connection with the interior colossal windows, just as the portals rise up to similar pointed arches, in a way similar to that in which they are employed as the particular form for the vaultings of the interior. Between these doors over the principal portal a large circular window branches out, the rose-window, a form which is, we may add, the exclusive and peculiar possession of this type of building, and only fitted to it. Where such rose-windows are absent we find substituted for them a still more colossal window with pointed arches. The façades of the transepts are divided in a similar way while the walls of the nave, the choir, and the aisles in their windows and their form, no less than in the position of the solid walls between, repeat in all respects the form of the interior and set the same forth on the outside.