opposite ends 10 and 11 the strip 6 has opposite ends 12 and 13 and the strip 7 has opposite ends 14 and 15 if each of the strips 4 7 were formed into rings by joining the opposite ends 8 9 10 11 12 13 and 14 15 then such joined ends would form a seam which when aligned vertically would reproduce the design d thus it would be a simple matter to rotate the rings in such manner as to align the seams and reproduce the design d and the puzzle would present no challenge according to the invention therefore the strips 4 7 are treated in such manner as to frustrate reproduction of the design d by reference to mechanical characteristics such as the aforementioned seams according to the invention the strip 4 is cut transversely along the line 16 to form two pieces 17 and 18 the piece 17 thus has ends 8 and 19 and the piece 18 has ends 9 and 20 the strip 5 is similarly cut along a vertical line 21 to form two pieces 22 and 23 the piece 22 having ends 10 and 24 and the piece 23 having ends 11 and 25 the strip 6 similarly is cut along the line 26 to form two pieces 27 and 28 with the piece 27 having ends 12 and 29 and the piece 28 having ends 13 and 26 in like manner the strip 7 may be cut along the line 31 to form two pieces 32 and 33 the piece 32 has ends 14 and 34 and.