Karolos is also inspired worker of stone and terracotta. Witnessing carving the limestone, transferring his soul to the project. As he says, "the success of my sculpture is that I give life to the sculptures. Sculptures are not souless - I feel that, without using blueprints." Heuristic, as a reference to the technique of processing terracotta, manages and creates very thin but highly durable surfaces with an advanced sense in that reference to the form and use of color tones. The works of terracotta acquire their own identity, bringing his own distinct fingerprint.