My names Dee, myself and my flatmate came from work on a friday afternoon in 2012 at about 5pm. While standing on our apartment balcony (Burgundy estate, Milnerton) looking towards the coastline while chatting about the day. Before i continue heres some background. Directly opposite us is the Chevron Refinery (now called Astron energy i think) Not too far is our Nuclear power plant called Koeberg Nuclear Power Station. While chatting we noticed a big triangle shape that was chrome..the object just appeared then it stood dead still in one place right above one of the tall towers where the flame usually comes out. It was hovering above it but high up. Then suddenly it started rotating, this is when we saw its actually a pyramid and not just a flat triangle. I ran in to grab my phone and binoculars, when i got outside again the bottom tilted to the side and just like that it vanished right in front of our eyes in a blink. First we thought maybe its some device that measure the flame or heat or some triangle balloon...but when it moved and disappeared we knew its not from here. It was the weirdest thing ever. I was too slow to get images.This happened late 2012 sometime, not sure about the exact date.