Uranium glass is one of the central elements in Rony’s work. It appears both in his art works as well as in his product design. The uranium reacts to ultraviolet radiation, and the sculptures literally glow in the dark, creating a magical effect. Uranium glass has been produced in Bohemia since the Baroque period, but due to the difficult fabrication process hardly anyone works with it in this way anymore. Thorn is part of a wider series exploring the connection of nature, the human body, and the Christian tradition. The sculpture is supposed to evoke a crown of thorns. The topic of spirituality is very important for Rony, and his monumental sculptures often materialize visually striking sacred objects.