North  Court Tube Dance  (1978).

It started on February 14 with a line of eight sedate tubes whose heights in feet were  1, 2, 3, 5, 8, 13, 21, 33, the famed Fibonacci sequence.  The shortest tube would go up and down most frequently.  It was the least significant digit of an electronic binary counter.  The counter was counting visitors to the court as they entered and interupted a light beam.  The tallest tube would ascend at the appearance of the 128th visitor and drop at the 255th.  After a few days, these tubes were replaced by eight' clear tubes whose heights were forty feet.
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  A week later, blue tubes appeared. Once I heard a visitor say to his companion, " See! Pay up." as several tubes collapsed and one tube ascended to express the next number of the binary count.  He had bet his friend that he could predict the next configuration of  up and down tubes.  He had discerned the binary pattern.


      Soon, tubes grew too big for the space.                     


 

   By the third week, larger diameter multicolored tubes dominated




  The largest tube was sealed strips of various colors.     
It was twenty feet in diameter and eightteen feet high.


  By the end of the show's run, slowly writhing tubes crowded the space of the court.




This is a detail of the inside of the largest tube.
The D.I.A.'s Modern Art curator, John Hallmark Neff,  discovered that he could grab a folding chair and a magazine, slip  inside this shape, hiding out in the middle of the North Court, and eavesdrop on visitors to the exhibit.