In Rajasthan there is a well with 3,500 steps, and every one of them exists for a practical reason

The first reaction on looking in is always the same: it seems a geometric caprice, a work built to impress. Three entire walls covered in staircases zigzagging downward, thousands of identical steps, an almost obsessive symmetry. It is hard to believe that all of it is, point by point, an engineering solution.

In this part of India water does not arrive spread through the year. It arrives concentrated in a short monsoon, July to September, and in the northwest of the state that means between 100 and 300 millimetres in total. For the other nine months practically nothing falls.

The water that soaks in during those weeks raises the water table, and from October that level starts to drop. Between the September high point and the June low there can be many metres of difference. That continuous fall, rather than drought in the abstract, is the technical problem behind all of this.

An ordinary well handles that fall badly. With a rope and a bucket, every metre the level drops means more effort, more rope and more risk that the bucket will not reach. And once the water is very deep, hauling out the volume a whole village needs stops being feasible by hand.

The stepwell inverts the proposition: instead of raising the water to the people, it lowers the people to the water. The steps cover the well's entire height, so that whatever the level is at that point in the year, there is always a step reaching exactly to the edge. In September you walk down four flights; in May, thirteen.

That is where the zigzag comes from, the part that looks decorative and is not. Descending thirty metres with a straight staircase would demand an enormously long ramp and a vast amount of excavation. Folding the staircase into flights that double back achieves the same drop in a far smaller hole, and it also lets many more people go down and up at once.

They did not build a beautiful staircase. They built the shortest possible staircase, and it turned out beautiful.

There is a side effect that ended up almost as important as the main one. At the bottom of the well the air stays five to six degrees cooler than at the surface. In a place where the average May high is around forty degrees, that difference is not a detail: it is the difference between being able to be outside and not.

That is why many stepwells have galleries, colonnades and chambers along one of their sides. They were not there to ornament the hole: they were the village's cool place, where people rested, waited and talked through the middle hours of the day. The well was hydraulic infrastructure and covered square at once.

Stepwells defined the subterranean architecture of western India from the seventh century to the nineteenth: twelve hundred years of continuous building. And then, in a short space of time, they lost their purpose.

During the British colonial period their hygiene was judged inadequate — open water, in contact with thousands of people and animals — and pipe and pump systems were installed that did the same job without anyone descending. It was a genuine sanitary improvement, and also the end of a kind of building.

Many were abandoned, some were filled in and others became rubbish tips. The ones that remain, restored and open, must be read in that double key: they are simultaneously a masterpiece of geometry and an obsolete technology, retired for good reasons. Both things at once.

Which is why it is worth stopping. A fort is understood by looking at it; a stepwell is not understood until you know what happened to the water between September and June. With that fact in mind, those 3,500 steps stop being a spectacle and become an argument.

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