An input key of the present invention, which is assigned a plurality of information items to be inputted, and which is assigned each of the information items to be inputted, according to a direction of a force exerted on the input key. A visual processing device 1 is provided with a spatial processing portion 2 and a visual processing portion 3. Spraying a viscous liquid such as an alginate or chitosan solution over and around the oil results in isolation of the oil from the seawater as the mixture has a density that is lighter than seawater and heavier than oil. Thus, the folding mechanism is folded and unfolded rapidly, easily and conveniently. A tanned and dyed leather is obtainable with a high color intensity, outstanding wet fastness and excellent grain tightness, wherein the dye is permanently and covalently bonded to the leather via a bridging group, preferably in the region of the surface, and the bridging group is essentially bonded to the leather via \u2014N\u2550CH\u2014 groups. Described is also a device which permits in particular objects having large surfaces to be scanned with little effort.