For several years now I have been puzzled by the appearance of shiny rotating metal pyramids fixed to some buildings in Pretoria.
The pyramid on top rotates, and flashes in sunlight, and in some places one can see several of them flashing on different buildings. This one is in Hatfield, on the National Lotto office building, opposite Hatfield station. But there are some fixed to buildings at Unisa, and in various other places. They are usually fixed to the top, on the roof, like this one, but sometimes they are further down, though I’ve only seen them on multi-storey buildings.
So they have a name? Do they have a function? Do they serve a purpose? Where do they come from, and what are they for?