The Kaleidoscope block is beautiful, but difficult to draw. With this ruler you can make Kaleidoscope blocks in 11 sizes, ranging from 6 inch to 16 inch. You use one end of the ruler to cut the isosceles triangles and the other end of the triangle to cut the corner triangles of the block. Quick and accurate, without intricate measurements. The ruler has the same blunted corners that Marti Michell's templates have, fitting the patches exactly together for sewing.