which is the higher and which is the lower ?哪个更高，哪个更低？

High and low
lithograph, 1947, 50.5 x 20.5 cm
 

In this print the same picture is presented twice over, but viewed from two different points. The upperhalf shows the view that an observer would get if he were about three storeys up; the lower half is the scene that would confront him if he were standing at ground level. If he should take his eyes off the latter and look upwards, then we would see the tiled floor on which he is standing, repeted as a ceiling in the centre of the composition. Yet this acts as a floor for the upper scene.

About the author

Maurits Cornelis Escher (17 June 1898 – 27 March 1972), was a Dutch graphic artist. He is known for his often mathematically inspired woodcuts, lithographs, and mezzotints. These feature impossible constructions, explorations of infinity, architecture, and tessellations.

web site