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The architectural eidos was based on the antithesis of function and aesthetics. Let us now find a meonal category embodying architectural eidos as an immobile substance.

The main quality of a substance is immutability. Immutability, considered from the point of view of pure change and pure temporal fluidity, is eternity. What is immutability, understood as eternity, in the sphere of architecture, which is meonal from the point of view of the first architectural and semantic triad? It can only be a very long stability in time, that is, durability. Durability is a correlate of immutability in the architectural field. If the substance is characterized by immutability, then the structure has (or should have) durability in architecture. Thus, structure is the substance presented architecturally.

What is a structure in itself?

In its most generalized form, a structure can be defined as a system of conjugations of material elements of an architectural form, realizing it as a material, substantial facticity. It is a way of the form existence in the world of dense matter.

Let us now define the structure through correlations with other areas.

Since the category of architecture is based on the category of the human body, let us find the bodily correlate of the structure. It's a skeleton. If the structure is the skeleton of a building, then the function is the totality of its systems and internal organs, and aesthetics is the living flesh of the image. As F. L. Wright wittily pointed out, Wright, "rattling bones is not architecture21." Cultivating a structure as an aesthetic value in itself is similar to the desire to express in speech not its meaning, but the grammatical rules of its construction.

From the general definition of the structure, let's move on to its detailing. Strength, stability, and rigidity are the main properties of a structure.

Strength is a function of a structure, consisting in its ability to maintain itself under various loads. This is the self-identity of the structure in relation to the moment when it began to experience the pressure of the load (or some other impact). If in the case of strength we are talking about the fundamental existence of the structure – its ability not to collapse under exposures and loads, then in the case of stability we mean the identity or constancy (equilibrium) of the spatial position of the structure under the same exposures and loads. Rigidity is characterized by the moment of immutability (or nuanced immutability) of the structure itself, without taking into account the general spatial position. Thus, it is possible to arrange the three known qualities of the structure into a sequential triad, where the same quality – constancy (otherwise identity, substance) in relation to loads and exposures – gives each time a new category depending on the type of semantic correlation:

1) The structure itself, as an actual reality: rigidity

2) The existence of the structure: strength

3) Spatial position of the structure: stability

Thus, a structure is the constancy of an architectural form in the world of actual substance, the realization of its substantial self-identity. A structure is the "how" of the material existence of the "what" of an architectural form.

Let's note that when understanding the form-structure relationship through the internal-external antithesis, these opposites flow into each other. In purely semantic terms, the form is, of course, "internal", that is, what is realized, and the structure is "external", what realizes. But in terms of material facticity, it turns out the opposite way: for the bodily sense of touch, the form is something external, the living flesh of the building, and the structure is its inner skeleton. Thus, during the transition from the ideal plan to the material one, the form becomes "external" from the "internal", and the structure, on the contrary, becomes "internal" from the "external".

Further development of the concept of structure involves the consideration of types of structures and is not included in the objectives of this work.