1. An identification device worn on a body of a person, the identification device producing an image of a pressure-distribution pattern obtained by sampling pressure during contact between a body part of the person and a substantially solid object, wherein different peak pressures at different points on the substantially solid object from the contact between the body part and the substantially solid object are represented in the image by a pressure-distribution pattern arranged to correspond to the different points and having a plurality of colors, wherein the different peak pressures have associated different colors; wherein the pressure-distribution pattern is obtained under a foot during walking on the substantially solid object and the pattern is configured to identify a shoe or a portion of a shoe worn by the person.