[□]
[□=□]
[!□]
He died on September 26 , 1935 , and was buried in Colorado Springs , Colorado . By 1935 , when the War Office began to prepare once more for war , there were only 3,000 equipped military hospital beds in the country . After 1935 , Escher also increasingly explored complex architectural mazes involving perspectival games and the representation of impossible spaces . Eskimo ulu ( ulo ) or woman 's knife was the basis for early speculation about the origin of these blades and possible relationships between northern cultures and prehistoric populations in New England ( Abbott 1881 ; Beauchamp 1897 ; and Willoughby 1973 [ 1935 ] ) . In 1935 the Court struck down the National Recovery Administration ( NRA ) as an unconstitutional exercise of legislative authority by the executive branch .