About the techniques
              The drawings are executed in pen and black ink on white paper, or in white crayon  and ink on black paper. 
              They measure 13.5 cm, 23 cm or 30 cm in height, and  their widths vary in size from 13.5 cm to 240 cm. 
              Next to the drawings, there are intaglio prints, combining mezzotint and dry point.