What are these rotating doodats?
For several years now I have been puzzled by the appearance of shiny rotating metal pyramids fixed to some buildings in Pretoria.
Strange rotating metal pyramids
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?
Notes from underground 
Aren’t they to scare away the pigeons? I suppose they must have a name . . .
Yes someone else also suggested that they were just urban scarecrows. I’m disappolinted. I thought they might be homing beacons for aliens from a distant galaxy, or anemometers for measuring solar wind, or something equally romantic.
Please ket me know the name
I’ve not discovered that they have a name, so until I do discover it, I’ll just refer to them as “urban scarecrows”.