Dynamap technology; multiple layers of information become viewable as the substrate is rotated across the viewing angle. By scrolling the mouse vertically, users are able to mimic this effect http://www.dynamap.com/flashdemo.html Images are interlaced by alternating horizontal strips from each. The resulting compound image is calibrated to a specially designed polymer lens substrate. Lenses contain between 60 to 200 micro-lenses per inch, depending on the desired outcome. The underlying Dynamap® technology essentially fools the human eye. By rotating the map, the angle of viewing is changed and one of the resulting three layers can be viewed. This is mounted to a backing, finished and packaged.