We adapted the approach of experimenting with invisible data and light phenomena. We want to make invisible data visible through light in the simplest possible way. We did several experiments with the “Refractography” which is the effect the light creates when it passes through a transparent object. We did the experiments with several materials like: plastic, glass and optical lenses. The project aim is to embody the light effect in the results we got in the courtyard of “Collegium Jenense”.