Bagatelle is a game played on a long flat board covered with cloth like a billiard-table, with spherical balls and a cue or mace. At the end of the board are nine cups or sockets of just sufficient size to receive the balls. These sockets are arranged in the form of a regular octagon, with the ninth in the middle, and are numbered consecutively from one upwards. Nine balls are used, generally one black, four white, and four red, the distinction between white and red being made only for the sake of variety. In the ordinary game, at starting, the black ball is placed on a point in the longitudinal middle line of the board, a few inches in front of the nearest of the sockets, and the player places one of his eight balls on a corresponding point at the other end of the board, and tries to strike the black ball into one of the sockets with his own. After this his object is to place as many of his balls as possible in the sockets. Each ball so placed counts as many as the socket is numbered for, and the black ball always counts double. He who first makes the number of points agreed on wins. The name bagatelle is also applied to similar variations of the game with a smaller board in which small balls about the size of a marble are propelled along a channel at the side with the object of having them catch in cups or sockets, each of which is numbered with a value of points, arranged over the surface of the board. Research Bagatelle
The octagon pot was a popular style of British clay chimney pot. Simple in design, but eight-sided so as to be more decorative than the plain round styles of chimney pot. Research Octagon Pot
In architecture a pendentive is the portion of a vault by means of which the square space in the middle of a building is brought to an octagon or circle to receive a cupola. The term is also applied to the part of a groined vault which is supported by, and springs from, one pier or corbel. Research Pendentive
 
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