A multi-layer three-dimensional display has three layers which are spaced apart in a common frame, with the front two being semi-transparent. Each layer is painted with a portion of an image, with the foreground details being on the front panel and the background on the back panel, etc. The central panel...http://www.google.de/patents/US5367801?utm_source=gb-gplus-sharePatent US5367801 - Multi-layer three-dimensional display
