Patent ID: 7199911

Claim:
An optical structure comprising: a substratum including an optically variable portion; at least one reflective graphical indicia laser-inscribed at least in the surface of the substratum, wherein the optically variable portion and the at least one reflective graphical indicia are arranged to offer a first optically variable image and a second reflective image visible via reflected light, respectively; and at least one laser-inscribed transmissive graphical indicia formed in the substratum and arranged to offer a transmissive image visible via light transmitted through the structure, the at least one transmissive graphical indicia being arranged to be substantially coincident with the at least one reflective graphical indicia, wherein the transmissive graphical indicia is formed by local and variable variations in depth of laser inscription through the substrate in localized regions and characterized in that the substrate is thin enough to allow for laser perforation therethrough.