Synthesis of superposition shape images by light interacting with layers of lenslets

A method for creating a superposable revealing layer lenslet grating and at least one base layer lenslet grating yielding, when superposed, a superposition shape image that shows a recognizable message, comprising the steps of:

• (i) selecting the recognizable message that is to appear as superposition shape image;
• (ii) selecting a layer layout synthesizing technique yielding said superposition shape image;
• (iii) defining layer layout parameters according to the selected layer layout synthesizing technique;
• (iv) generating from the shape image of the selected recognizable message both the revealing and base layers, where the revealing layer comprises spatial information specifying the layout of the revealing layer lenslet grating and where the base layer comprises spatial information specifying the layout of the base layer lenslet gratings;
• (v) fabricating the revealing layer lenslet grating laid out according to the revealing layer spatial information and the base layer lenslet gratings laid out according to the base layer spatial information by applying techniques selected from the set of lithographic techniques, laser writing techniques, etching techniques, reflow techniques and embossing techniques;
• where said revealing layer lenslet grating and base layer grating comprise arrays of cylindrical lenses;
• where said recognizable message is selected from the set of text, numbers, graphical symbols, picture with recognizable elements, face image, typographical characters, numerals, logos, and spatial codes;
• where the superposition shape image results from the sampling action of the revealing layer lenslet grating on the plane on which the base layer lenslet grating concentrates the incoming light;
• and
• where upon tilting of the superposed revealing and base layer gratings the superposition shape image evolves dynamically.