A moiré pattern display sheet defined by a surface is described. A first layer has a pattern printed thereon. The pattern includes a series of visual elements in a first row that have been distorted at least in a first direction. The series of visual elements is generated from an electronically saved...http://www.google.de/patents/US20080213528?utm_source=gb-gplus-sharePatent US20080213528 - Customized printing with depth effect
