While charcoal can be an unforgiving medium when it comes to drawing, Korean artist Seon-Ghi Bahk has been using it in his installations since the 1980s. As if drawing or painting in thin air, Bahk hangs the pieces of charcoal on nylon threads, aggregating them into 3D forms in a pointillistic fashion. Bahk has said that he purposely sets himself up for this frustrating and challenging way of working in order to make his work the product of “endless penance and agony,” as he puts it in his artist statement. He channels his dark emotions from the process of creating one work to starting the next. Take a look at some of his installations below.