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 Prior to construction of any building, palace, temple, village or city; Quechuas had a process of physical planning tending to ensure later success. Undeniably knowledge used was not only a product of creative capacity of these Andean villagers, but a many centuries accumulation of continuous cultural development.
Prior to executing any construction Inkas made some sketches and designs, and models or maquettes in scales which measurement systems mainly based in anthropometry (measures with relationship to the human body: arms, elbows, feet, steps, spans, etc.) are lost.
Around the world, no other ancient or modern civilization could ever reach the technique, skills and ease to carve lithic material as Quechuas did in this corner of the earth. Inkas are recognized among some other aspects, for their balanced social organization, their mastered and peculiar way to work stones, their advanced knowledge in planning and engineering, and because of their epoch and without intervention or influence from other intercontinental cultures they developed one of the most advanced civilizations of the planet.
There are still some doubts about the way how stones were fitted so precisely. There are some hypothesis that are framed inside logical possibilities: the most feasible indicates that work was very slow but effective and as it is normal walls were started by the lower part taking care of just the lateral fits, the following upper row was more complex because stones had to fit laterally as well as in the lower joints. In this case it is proved practically everywhere in Qosqo that upper faces of lower stones were carved slowly bumping them with stone hammers according to the shape of the inferior surface of upper stones. The work was relatively simple when manipulating small or medium stones, because they could be placed or tried many times; but problems arose when working with megalithic boulders of dozens and even hundreds of tons. Reality suggests that Quechuas could use natural size models or maquettes made on light materials and perhaps clay. Those models were supposed to be reproduced exactly on huge boulders; surely, use of this method helped enormously making works easier.
On the wall surfaces, stone side views (cross sections) may be "cushioned" (semi-round edges), convex, beveled or flat. Meanwhile, their joints may be carved or polished. Normally, Inkan walls are leaning or have some inclination inwards. There is not a general rule or measurement for that inclination and its main duty was to search some balance between the walls that support each other. Commonly the lower stones are bigger or have more volume than the upper ones. Besides, Inkan walls are frequently wider on the base than on the superior part. Moreover, the classical shape of Inkan architecture is the trapezoid that gives a stability and balance sensation. It is undeniable that immortality was searched; the way how to make anti seismic buildings, everlasting and indestructible by any natural catastrophe. Only men, blinded by fanatical ideologies could destroy them partially.
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