2020 First prize
Kokichi Sugihara “3D Schröder Staircase”. Meiji University
Author description: A traditional Schröder staircase is a 2D picture having two interpretation, a staircase seen from above and that seen from below, and the second interpretation can be perceived easily if we turn the picture upside-down. The present 3D object also has two interpretations, both of which are staircases seen from above, and the interpretations switch from one to the other when we rotate the object by 180 degrees around the vertical axis.