Unique sculpture - Vertical kilometer (10 photos)

The work of American sculptor Walter De Maria is very unique and distinctive.
In 1977, on an area of ​​Frederick in the German city of Kassel was set rig.
For 79 days, she drilled a well depth of one kilometer ...




 
Then lowered into the hole brass rod diameter of 5 cm and a length of 1 kilometer




And all this is covered up massive plate with a hole in the center.







Today it looks like this:



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