Selman Trtovac expresses himself artistically primarily in the medium of drawing. which he defines  as the primary energy for all subsequent fields of art. The drawing series with the title E-Line (2001-2019) was practiced as a kind of flow in a long-term, namely as the idea of ​​a single line continues on and on. The last part of E-Line was produced in 2019 especially for the Graz University of Technology, Institute for High Voltage Technology.