An anatomically approximate prosthetic heart valve includes dissimilar flexible leaflets, dissimilar commissures andor a non-circular flow orifice. In an embodiment, a method for masking includes performing a prediction for at least one multimedia data block based on a prediction mode of a plurality of prediction modes. The method is described principally with respect to applying a leather material layer to a surface of a base sole, and the method may be employed to apply a leather material layer to shoe portions other than a surface of the base sole, such as a surface of the outer sole, insole, or inner sole, or a surface of a whole shoe. The decorative material may be hairs attached to supporting sheet or LED material. Systems configured for such tracking may include the capability to either or both detect tampering with the medical device and to effectively expose the medical device to sterilization substances while the medical device is captured by a mechanism including an identifying characteristic. The latter is located at a minimum difference in height relative to the horizontal upper part of a conveyor belt of the signatures or sheets coming from the loader and at a short distance from the plane of the feeder.