This steel structure was built for the Metreon in San Francisco.
The total diameter of this piece was about 20 feet. It had to be built in pieces so that it could be transported and brought up to the 3rd ﬂoor of the Metreon. Once it was delivered, it was assembled and installed.
These aluminum frames were 1 out of 8 sets that also went to the Metreon. Once assembled there, the total length of each unit was 18 feet.