In Saint Petersburg as in any other European city happens once a year Museum Night. In order to take part in it museums should prepare special theme evening or night program. For this type the theme was ‘Light and Color’. Crystal is a concept of the project that was conjointly created by me and Sonya Kochina for the Geological Museum of Saint Petersburg. Our decision to the extent of this project was creation of this light sculpture (my side of the project) and billboards and augmented reality postcards (Sonya’s part of the project).