The present invention relates to three-dimensional products comprising a structure having a first surface and a z-direction perpendicular to the first surface, the structure further comprising a base, a plurality of raised protrusion areas raised at least about 300 μm above the base of the structure,...http://www.google.es/patents/US7320821?utm_source=gb-gplus-sharePatente US7320821 - Three-dimensional product with dynamic visual impact
Three-dimensional product with dynamic visual impact
