Abstract: A flexible shaft coupling is comprised of a tubular hub made of a rigid material, wherein the hub is provided with a slit extending substantially circumferentially for providing flexibility to the hub, the hub having an axial bore so that a rotational force of a drive rotation shaft received in the axial bore at one end of the hub can be transmitted to a driven rotation shaft attached to the other end of the hub, wherein circumferential ends of a part of the hub adjoining the slit are each provided with a convex shape having an arcuately receding surface at least at an outer peripheral portion.

Abstract: To create a three-dimensional impression from a normal two-dimensional planar photograph or picture, the photograph stand of the present invention maintains the photograph part-cylindrical, part-spherical or otherwise curved condition. It can be achieved by interposing the photograph between two curved shape retaining panels, or, alternatively, bringing the two side edges of the photograph or a resilient shape retaining panel on which the photograph is mounted closer together. The latter mode can be achieved by using suitable engagement portions or receiving the photograph in a transparent tube whose circumferential length is shorter than twice the lateral width of the photograph. By providing mirror surfaces on either side of the curved photograph, preferably with the mirror surfaces fanning out toward the front at an appropriate angle, the photograph stand can add not only a depth to the photograph but also an increased width to the photograph.