A reusable flexible fishing lure, including a head, a body, and a tail, is characterized in that it includes at least one cut-out forming a rupture initiator, at right angles to the junction of the head and the body. According to the invention, the die is arranged to slide in the axial direction with respect to the extruder frame and comprises a flow channel, which is under pressure of the material to be extruded and tapers conically towards the nozzle, and that the ratio of the area of the die’s annular front surface to the area of the projection surface of the flow channel’s conical section is between 0. Each of the fiber sets includes a plurality of fibers. In one embodiment, the screen images are captured at configurable time intervals. The invention also relates to a method of embedding one or more data symbols in the luminance output of such an illumination device, an optical receiver and an illumination system. The high speed processor built in the main body calculates the sliding speed, the sliding direction and the sliding time on the basis of the pulse signals A and B.