The set consists of smaller elements which complement one another in shape like jigsaw puzzle pieces in such a way that, being interconnected by circular dovetail type connectors situated on the edges, they fill up a larger area of a circular geometric figure. It consists of a central element (1,1a) and many concentric ring-shaped sectors (2 a, 2b, 2h) which, selected according to the radii (r1, r2) and the central angle (co) are interconnected by dovetails (3) on radially oriented edges, forming at least two ring-shaped fields including the central element (1,1a).

An education and recreation tool having a main body with one or more cutouts formed on at least one surface of the main body. The tool can include multiple puzzle pieces. Each puzzle piece can be formed in a proper shape and size in order to be put fittingly into only one cutout on the main body. At least one meaningful word or image can be provided on the top surface of each puzzle piece and at least one image or meaningful word is provided on the bottom surface of each cutout to illustrate or explain the word or image on the top surface of the respective puzzle piece based on the fitting of the puzzle piece and the associated cutout.

An education and recreation tool, comprising a main body (10, 20) in shape of a board or any cube, with one or more cutouts (11-14, 21-27, etc) formed on at least one surface of the main body; a plurality of couples of puzzle pieces (111-114, 221-227, etc), wherein each couple of puzzle pieces are formed properly in order to be put fittingly into one or more cutouts on the main body, and each couple of the puzzle pieces consists of one upper puzzle piece and one lower puzzle piece in similar shape and size; and at least one character or image is provided on the top surface of each upper puzzle piece and at least one image or character is provided on the top surface of each lower puzzle piece to illustrate or explain the character or image on the top surface of the respective upper puzzle piece in the same couple is provided.

A three dimensional structures, which may be formed as a three-dimensional jigsaw puzzle, are described. The structure has one or more viewing directions along which different images are viewable. An image to be presented is divided into image portions that are applied to primary surfaces, where the structure has the primary surfaces arranged to present the image when viewed along an axis. The structure may also have secondary surfaces that are hidden from view along a viewing direction, and which become viewable when the structure is rotated relative the viewer. The structure may also be in a puzzle, which may be in the form of a kit.