Double Ascension (1973) 

Herbert Bayer

DESCRIPTION:  20-foot high by 30-foot diameter painted steel sculpture, mounted within a 50-foot diameter continuous pool

According to Arthur A. Cohen, Herbert Bayer based this sculpture on the design of his earlier works "Articulated Wall", "Double Twist", and "Stairs to Nowhere" [in Cohen, A. A. (1984), Herbert Bayer,  MIT Press].   
The title 'Double Ascension,' however, was not Bayer's initial choice.  A popular (but unverified) claim was that Bayer originally titled the piece "Stairway to Nowhere" and had to modify the unwelcome title at the request of the corporate client. 
LOCATION:  City National Plaza, 515 S. Flower Street, Bunker Hill, Los Angeles, California, USA