We have just created the brand THE RAYY which sells very special jewellery. They have the particularity of reflecting sunlight to form a hidden message in the gold of the ring. By structuring the surface of gold with great precision, we can change the direction of the light rays, very lightly but sufficiently so that they can concentrate and form a message of light. This technology was developed by Professor Mark Pauly in his Computer Graphics and Geometry Laboratory. It is there that we have all worked and helped to improve this technology, which is now on the market thanks to the Rayform start-up. Since the starting of Rayform, we’ve been developing a software with our preparatory algorithms. In order to take an image and take parameters of where the light is, where the shape is, where the image should be projected. We take that all together to be able to calculate a form that we need to put onto that object in order to make whatever image. This technology that allows us to create images of light is inspired by nature. It comes from an optical phenomenon called caustics. It is this phenomenon that we find at the bottom of a swimming pool when there is sunshine. Very beautiful patterns appear, which are a little random. That’s really the basic inspiration. The question then was: Can we control this effect and tame the light? Can we make not just random effects, but extremely precise images ? Over the past three years, we have applied our technology in many different areas. For example, we have worked with many artists to create outdoor large-scale installations that use the sun as a source of light, such as the sol.id installation in the Rolex Learning Center building at EPFL. Other applications also for anti-counterfeiting, i.e. preventing people from copying products, whether watches or security documents. This can be applied in many different areas. What is interesting is that you only need to have a light source to check if the product is a real or a fake.