[[1]] rings arranged one on top of the other are called ring wells.

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Ceramic rings arranged on top of the other are called ring wells.
Sculptors sculpted scenes of people living in towns, villages, and woodlands. Many of these sculptures adorn the railings, pillars, and entrance ways of public buildings. The stories in the Jataka were most likely penned by ordinary people and subsequently recorded and preserved by Buddhist monks. Jatakas, art, archaeology, and travellers are a few sources of information on early towns. Many of the cities that first appeared around 2500 years ago served as the mahajanapadas' capitals, and some of them were encircled by enormous fortress walls. Ring wells were built using ceramic rings or rows of pots placed on top of one another. In-ring wells were used to dispose of waste and drainage. Sometimes people use these as restrooms. Hence the answer is Ceramic.

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