1. A method for creating a target image with an animated microstructure, where the target image is made of a succession of target image instances which differ from each other by an embedded microstructure which evolves over time, the method comprising the steps of (a) defining an original image; (b) defining how the embedded microstructure evolves over the succession of target image instances; and (c) rendering from the original image a succession of target image instances comprising the evolving embedded microstructure.