Maurits Cornelis Escher ( June 17 1898 â `` March 27 1972 ) , usually referred to as M. C. Escher , was a Dutch graphic artist .
Maurits Cornelis Escher ( 17 June 1898 â `` 27 March 1972 ) , usually referred to as M.C. Escher ( Ë É Ê É r , ) , was a Dutch graphic artist .