The main part of Sebastian Bieniek's conceptual art is Bieniek-Text (BieniekText). It's 

textartwork by the artist, which is artwork based on text, made with text or letters, usually painted on back of canvas. It's a conceptual way to create art with words and letters. Often to show the ambivialance in a meaning and a nonsense in the sens.

However Sebastian Bieniek is also making performances and other conceptual art, like the Barriertape Art, abstract paintings and some videos which you can also see here.