Rectangular shape consisting of what resembled plumbing joints connecting the four sides together hovered above us and shot straight up

I was 10 or 11 when I saw this object in the sky right above us. It was not sperical but square to rectangular and made of what resembled plumbing joints joined together to form a rectangular shape which was hollow in the center...don't know how to better describe it. 
It was silver in color and hovered about 200 feet above us as we were playing in the street.  It hovered there for a couple of minutes and then went straight up into the sky and disappeared from sight. There were no lights, no sounds, just this object in the air above us. 
I have never seen a similar object reported so have hesitated reporting this but I am curious so will report it now.
Date probably is approximate, although the witness does not indicate that fact.  PD