Upon closer inspection, the straight horizontal joints running throughout the entire wall has an even more exact and purposeful shape to them. Every stone base is not straight. Instead, the bottom of one is curved out slightly to fit exactly into the inward curve of the block below it. While these shapes are relatively minute, they are obviously not a mistake, due to their precise nature. The intention of the stonemasons seems to focus on making a very strong wall where the stones would lock in place rather than simply rest the top of each other. Still, despite the regular curves, each juncture has no gaps or errors.
No doubt exists in any architectural historian's mind that the stones that make up this temple wall were not fitted haphazardly or without exceptional degrees of skill and care. The stone-cutters or builders who constructed the temple must have spent a lot of time achieving these perfect locking fits. The understanding of construction strength that let these ancient people to create the curved edges that locked together is considerable. There wall was able to withstand earthquakes, for example, much more effectively than a wall with perfectly straight stone edges would.
Add to the considerable skill the fact that the joints shows signs of vitrification, and even more questions arise about how the people before the Inca could have such a high degree of knowledge and skill when it came to building with stones. Any archaeologists studying the site only has to play a flashlight across the seams in the evenings or night to see the reflective surfaces and joints. Whatever process they used; the end result was a much stronger bond at the joints than if the vitrification did not occur.