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Items of furniture having interlocking parts formed of basic shapes include a chair formed of a circular back-support part, square legs, and a triangular seat. In a second embodiment, the back-support part of the chair is of octagonal form. In a third embodiment, a companion table has a circular tab

Items of furniture having interlocking parts formed of basic shapes include a chair formed of a circular back-support part, square legs, and a triangular seat. In a second embodiment, the back-support part of the chair is of octagonal form. In a third embodiment, a companion table has a circular tabletop and legs formed of squares with material-saving cut-outs formed in them. In all embodiments, the parts are slotted to receive slots of equal depth formed in mating parts so that the assembled furniture item is strong and stable. The furniture items have aesthetic appeal and teach children about basic shapes, the art of design, and the art of construction.

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[ What is claimed is:] [1.] A chair, comprising:a flat back-supporting part of predetermined geometric configuration;a flat, triangular seat part;a flat, square, first leg member;a flat, square, second leg member;said first and second leg members having a common predetermined size;a pair of parallel

[ What is claimed is:] [1.] A chair, comprising:a flat back-supporting part of predetermined geometric configuration;a flat, triangular seat part;a flat, square, first leg member;a flat, square, second leg member;said first and second leg members having a common predetermined size;a pair of parallel, transversely spaced apart slots formed in said back-supporting part, said slots being in open communication with a peripheral edge of said back-supporting part and having a common predetermined depth;a slot having closed ends formed in said back-supporting part;said slot having closed ends having a longitudinal axis disposed normal to respective longitudinal axes of said transversely spaced apart slots and said slot having closed ends being positioned midway between said transversely spaced apart slots;a pair of parallel, transversely spaced apart slots formed in said seat part, said slots formed in said seat part having a common predetermined depth, and said slots formed in said seat part being respectively in open communication with two sides of said seat part that meet to form an apex of said seat part;said apex being slideably disposed in said slot having closed ends when said chair is in an assembled configuration;each leg member of said pair of leg members having a first pair of parallel, transversely spaced apart slots of of common predetermined depth formed therein in open communication with an upper edge of each of said leg members at a preselected common angle slightly inclined relative to a vertical plane to determine a slope of said back-supporting part and to slideably receive said transversely spaced apart slots formed in said back-supporting part;each leg member of said pair of leg members further having a second pair of parallel, transversely spaced apart slots of common predetermined depth formed therein in open communication with a leading edge of each of said leg members to slideably receive said pair of slots formed in said seat part;whereby said back-supporting part, said first and second leg members and said seat part are interconnected to form a chair by said slots which mate with one another when the chair is assembled.