A method for producing an anisotropic optical device that enables the viewer to perceive a repertoire of preselected images over a first range of angles of regard in previously unachievably thin anisotropic sheets. The device, which is useful as advertising media in a wide variety of forms, includes...http://www.google.ca/patents/US6373636?utm_source=gb-gplus-sharePatent US6373636 - Heat stabilized and dimensionally stable thin lenticular film
