Here's the third key argument from "The Nature of Gothic", an influential essay by John Ruskin. Like the first and second parts, it may be a valuable read, possibly for people with an interest in 40K, but maybe all the more so for anyone creating or thinking ahead.

Again, stay with it. It's over 160 years old, but still in English, and the ideas shine bright.
 
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The third constituent element of the Gothic mind was stated to be NATURALISM; that is to say, the love of natural objects for their own sake, and the effort to represent them frankly, unconstrained by artistical laws.

This characteristic of the style partly follows in necessary connection with those named above. For, so soon as the workman is left free to represent what subjects he chooses, he must look to the nature that is round him for material, and will endeavour to represent it as he sees it, with more or less accuracy according to the skill he possesses, and with much play of fancy, but with small respect for law. ...
... considering all artists as either men of design, men of facts, or men of both, the Gothic builders were men of both; ... considering all artists as either Purists, Naturalists, or Sensualists, the Gothic builders were Naturalists.
... Their power of artistical invention or arrangement was not greater than that of Romanesque and Byzantine workmen; by those workmen they were taught the principles, and from them received their models, of design; but to the ornamental feeling and rich fancy of the Byzantine the Gothic builder added a love of fact ... Both Greek and Roman used conventional foliage in their ornament, passing into something that was not foliage at all, knotting itself into strange cup-like buds or clusters, and growing out of lifeless rods instead of stems; the Gothic sculptor received these types, at first, as things that ought to be, just as we have a second time received them; but he could not rest in them. He saw there was no veracity in them, no knowledge, no vitality. Do what he would, he could not help liking the true leaves better; ...
...
I do not say that this love of veracity is always healthy in its operation. ... there is [a] kind of error ... in which the love of truth is too hasty, and seizes on a surface truth instead of an inner one. ... The love of truth, as such, is good, but when it is misdirected by thoughtlessness or over-excited by vanity, and either seizes on facts of small value, or gathers them chiefly that it may boast of its grasp and apprehension, its work may well become dull or offensive. Yet let us not, therefore, blame the inherent love of facts, but the incautiousness of their selection, and impertinence of their statement.
I said ... that Gothic work ... was naturalist. ... And this tendency is both increased and ennobled by the same Christian humility which we saw expressed in the first character of Gothic work, its rudeness. ... The Greek sculptor could neither bear to confess his own feebleness, nor to tell the faults of the forms that he portrayed. But the Christian workman, believing that all is finally to work together for good, freely confesses both, and neither seeks to disguise his own roughness of work, nor his subject's roughness of make. ... Hence Gothic sculpture and painting are not only full of valuable portraiture of the greatest men, but copious records of all the domestic customs and inferior arts of the ages in which it flourished.
There is, however, one direction in which the Naturalism of the Gothic workmen is peculiarly manifested; and this direction is even more characteristic of the school than the Naturalism itself; I mean their peculiar fondness for the forms of Vegetation. In rendering the various circumstances of daily life, Egyptian and Ninevite sculpture is as frank and diffuse as the Gothic. ... and the early Lombardic and Romanesque sculpture is equally copious in its description of the familiar circumstances of war and the chase. But in all the scenes portrayed by the workmen of these nations, vegetation occurs only as an explanatory accessary; the reed is introduced to mark the course of the river, or the tree to mark the covert of the wild beast, or the ambush of the enemy ...
... The nations whose chief support was in the chase, whose chief interest was in the battle, whose chief pleasure was in the banquet, would take small care respecting the shapes of leaves and flowers; and notice little in the forms of the forest trees which sheltered them, except the signs indicative of the wood which would make the toughest lance, the closest roof, or the clearest fire. ... In that careful distinction of species, and richness of delicate and undisturbed organization, which characterize the Gothic design, there is the history of rural and thoughtful life, influenced by habitual tenderness, and devoted to subtle inquiry; and every discriminating and delicate touch of the chisel, as it rounds the petal or guides the branch, is a prophecy of the development of the entire body of the natural sciences, beginning with that of medicine, of the recovery of literature, and the establishment of the most necessary principles of domestic wisdom and national peace.
... the Gothic did not arise out of, but developed itself into a resemblance to vegetation ... It was no chance suggestion of the form of an arch from the bending of a bough, but a gradual and continual discovery of a beauty in natural forms ... The Gothic architecture arose in massy and mountainous strength, axe-hewn, and iron-bound, block heaved upon block by the monk's enthusiasm and the soldier's force; ... Gradually, as that monkish enthusiasm became more thoughtful, and as the sound of war became more and more intermittent beyond the gates of the convent or the keep, the stony pillar grew slender and the vaulted roof grew light, till they had wreathed themselves into the semblance of the summer woods at their fairest, and of the dead field-flowers, long trodden down in blood, sweet monumental statues were set to bloom forever, beneath the porch of the temple, or the canopy of the tomb.
... The green herb is, of all nature, that which is most essential to the healthy spiritual life of man. Most of us do not need fine scenery; the precipice and the mountain peak are not intended to be seen by all men ... But trees and fields and flowers were made for all, and are necessary for all. ...
 

This time too it's just a fraction of the material, and it's worth reading the whole essay if you can. For the keen, there's more in the videos here, and on these aspects especially.

The fourth part is here.
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