WINDOW RESEARCH INSTITUTE

I realized something was strange here in the centenarianʼs Yaodong. The entrances to Yaodongs are generally shaped into a pointed arc, but upon closer inspection, I noticed that the corner arches were only half-finished.

Come to think of it, there was a similar arch in the old womanʼs Yaodong, too. Looking through the photos I took, every Yaodong I stayed at – including my current lodgings – had a similar construction. I had only assumed there to be a series of complete arches in a Yaodong, but this was not the case. How were they created?

Later I looked into the way these arches were constructed.

Consider the following schematic outline below: in order to dig three rooms above and below and two rooms to the left and to the right in order to create a square hole in a courtyard, one would imagine that these rooms are arranged at equal intervals, like the first drawing below. But in reality, Yaodongʼs were created following the second drawing.

Both Yaodong are similar in terms of the number and size of rooms. In terms of the actual construction of a Yaodong, however, because corner room are arranged as closely as possible to each other, and sometimes because they even share an entrance, the area of the courtyard may be reduced by up to two-thirds.

This is due to the difficulty associated with excavating soil, a simply rational reason. The fact that this attempt at reducing labor results in the construction of very variations in openings is both wonderful and charming.

In the picture above, an arch and square opening join at the corner. This is a half-outside space furnished with a furnace. It becomes a slightly ambiguous place not unlike the spaces under eaves or the earthen floors often encountered in Japanese architecture.

It is hard to imagine that such a design was planned from the outset. One might say that it is a unique opening resulting from this cultureʼs hundreds and thousands of years of excavation in the loesses.

In other words, in this opening at the corner, we can see an original design created by “the needs of the underground.”

“The needs of the underground,” which are the norm for the people living in the loesses, seems pretty original for the “people above ground.” Even in this village, too, residents are moving above ground, and the Yaodong are starting to be abandoned. But even if those caves are buried again, itʼs said that new houses wonʼt be built above them. The loss of “the needs of the underground” will remain for hundreds of years to come.