A multistage prism window includes first and second transparent plate materials, a first prism, a reflection member, a second prism, and a heat absorption member. The first prism collects, onto the reflection member, light whose angle with respect to a normal line of the first and second transparent plate materials is equal to or greater than a first predetermined angle and transmits light whose angle with respect thereto is smaller than the first predetermined angle. The second prism collects, onto the heat absorption member, light whose angle with respect to the normal line is smaller than the first predetermined angle and equal to or greater than a second predetermined angle and transmits light whose angle with respect thereto is smaller than the second predetermined angle.

A target support tool includes: a base member including a first arm and a second arm connectable to each other to form a bent therebetween; a magnetic support part at least on the first arm; and a retroreflector at the bent of the base member.

A portable signaling device and method of use in which an elongated reflected strip with a broad and flat profile is held taut in air so that the elongated reflective strip freely twists and rotates along a line formed between a first and a second attachment point of the composite strip when a breeze contacts the broad and flat profile to create a visual signaling display as a result of twisting and rotation of the elongated reflective strip.

A portable signaling device and method of use in which an elongated reflected strip with a broad and flat profile is held taut in air so that the elongated reflective strip freely twists and rotates along a line formed between a first and a second attachment point of the composite strip when a breeze contacts the broad and flat profile to create a visual signaling display as a result of twisting and rotation of the elongated reflective strip.

A gimmick expression medium producing method forms a gimmick expression medium 300. The gimmick expression medium 300 includes a retroreflective medium 1. A printing medium 301 placed on the retroreflective medium 1 includes a light-transmission layer 302. A gimmick print 303 which varies color of reflective light of the retroreflective medium 1 to produce a gimmick effect is printed on the light-transmission layer 302. The printing medium 301 is provided with a light-blocking layer 304 which partially blocks reflective light reflected by the retroreflective medium 1. The light-blocking layer 304 is composed of a white printing layer, and a reflection picture print 305 is printed on the light-blocking layer 304. The reflection pattern printing 305 and the gimmick print 303 are placed in adjacent to each other using a stripe-shaped (or dot-shaped) lattice pattern 306, printing which can be seen on a printed matter under normal illumination and printing which can be seen under light source such as flash light can be printed at one time (one-pass) by the same printer.

A vehicle surface 30, preferably wherein the vehicle is an aircraft, is described. The vehicle surface 30 comprises thereon and/or therein a set of retroreflectors 300, including a first retroreflector 300A, configured to reflect, at least in part, incident hostile light towards a source thereof.

A lure for fishing according to an embodiment of the present disclosure includes a body that includes a cavity inside the body, the cavity being visible from outside, a plurality of reflecting surfaces or reflectors that can specularly reflect light from the outside is provided on at least any of an outer face of the body, an inner face of the body, and an inside of the cavity, and the light from the outside is specularly reflected plural times.

A lure for fishing according to an embodiment of the present disclosure includes a body that includes a cavity inside the body, the cavity being visible from outside, a plurality of reflecting surfaces or reflectors that can specularly reflect light from the outside is provided on at least any of an outer face of the body, an inner face of the body, and an inside of the cavity, and the light from the outside is specularly reflected plural times.

A target device, which allows a sufficient amount of reflected light to be obtained from an end portion, is provided and includes a measurement section. In the target device, a retroreflective layer in which a plurality of retroreflective elements are arranged on the entire circumference in a circumferential direction about an axis is formed on at least part of the outer peripheral surface of the measurement section. The retroreflective layer is formed into an uneven shape in which a distance from the axis changes along the entire circumference in the circumferential direction.

A target device, which allows a sufficient amount of reflected light to be obtained from an end portion, is provided and includes a measurement section. In the target device, a retroreflective layer in which a plurality of retroreflective elements are arranged on the entire circumference in a circumferential direction about an axis is formed on at least part of the outer peripheral surface of the measurement section. The retroreflective layer is formed into an uneven shape in which a distance from the axis changes along the entire circumference in the circumferential direction.