A stool is one of the earliest forms of seat furniture. It bears many similarities to a chair. It consists of a single seat, for one person, without back or armrests (in early stools), on a base of a stool there are either one , two, three or four legs. A stool is generally distinguished from chairs by their lack of arms and a back. Variants exist with one, two or five legs and these various stools are referred to by some people as "backless chairs". Some modern stools have backs. Folding stools can become flat, typically by rotating the seat to be parallel with fold-up legs.
Some stools are designed with three legs; because three points define a plane, these will not wobble, even if placed on an uneven floor.
The origins of stools are lost in time although they are known to be one of the earliest forms of wooden furniture. The diphros was a four-leg stool in Ancient Greece, available in both fixed and folding versions. Percy Macquoid claims that the turned stool was introduced from Byzantium by the Varangian Guard, and thus through Norse culture into Europe, reaching England via the Normans.
In the medieval period, seating consisted of benches, stools and the very rare examples of throne-like chairs as an indication of status. These stools were of two forms, the boarded or Gothic stool, a short bench with two board-like feet at the ends and also the simple turned stool. Turned stools were the progenitor of both the turned chair and the Windsor chair. The simplest stool was like the Windsor chair: a solid plank seat had three legs set into it with round mortice and tenon joints. These simple stools probably used the green woodworking technique of setting already-dried legs into a still-green seat. As the seat dries and shrinks, the joints are held tight. These legs were originally formed by shaving down from a simple branch or pole, later examples developed turned shapes.
Artefacts of the three-legged stools are extant from the 17th century[where?], as is an illustration of an early turned stool of this period. One of the uses for three-legged stools is for farm workers in milking cows.
Later developments in the 17th century produced the joined stool, using the developing techniques of joinery to produce a larger box-like stool from the minimum of timber, by joining long thin spindles and rails together at right angles.
Several kingdoms and chiefdoms in Africa had and still have traditions of using stools in the place of chairs as thrones. One of the most famous of them, the Golden Stool of the Asantehene in Ghana, was the cause of one of the most famous events in the history of colonized Africa, the so-called War of the Golden Stool between the British and the Ashanti.
The backstool represents an intermediate step between the development of the stool and the chair. A simple three-legged turned stool would have its rear leg extended outwards and a crossways pad attached. Backstools were always three-legged, with a central rear leg.
Turned backstools led in turn to the development of the three-legged turned chair, where the backrest was widened and supported by diagonal spindles leading down to extensions of the front legs. In time these diagonal supports became larger, higher and more level, leading to the turned armchair design.
In modern times, the term "stool" has become blurred, and many types now have backs.
These are particularly common among bar stools, tall stools for seating at a counter, often fixed in place. These are a development of the chair as much as the stool, made more compact to allow dense seating around a serving table or counter. They may even be referred to as "backless chairs". One type of stool, Windsor-back stools, which "are popular in traditional homes", has a back.
Such backstools developed from around 1900, with the advent of modern materials such as bentwood and later the bent steel tube of Marcel Breuer's work at the Bauhaus. These isotropic materials no longer depended on the shapes of traditional joinery, as developed for earlier stools, and so strong backs could be attached arbitrarily, without relying on particular leg placements for strength.
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- Chinnery, Victor (1979). Oak Furniture: The British Tradition. Woodbridge, Suffolk: Antique Collector's Club. p. 87. ISBN 0-902028-61-8.
- Macquoid, Percy (1988) . A History of English Furniture. Studio Editions. p. 37. ISBN 1-85170-080-3.
- Chinnery 1979, p. 261
- Holme, Randle (c. 1649). Academie of Armory.
a Turned stoole...This is so termed because it is made by the Turner, or wheele wrioght all of Turned wood, wrought with Knops, and rings all over the feete..., reprinted in Chinnery 1979, p. 87
- Chinnery 1979, p. 231
- Chinnery 1979, p. 94
- Megan Buerger (15 April 2015). "The best stools for small spaces". Washington Post.