If there were a caption to that photo, it would be - "people sitting on seats that are hanging from ropes, off the top of a large skyscraper." There's no apparent secondary support or even belt, crazy! They're all wearing hard hats, though, which is a rather optimistic take on the powers of modern hard-hats. There's also buckets next to them, filled with cleaning fluid I guess.
Some of the windows aren't quite so easy to reach, this window-washer is put in a very awkward position to reach them...
This requires another guy on the ground, pulling the rope to the side. This picture also gives a better idea for just how thick the rope isn't.
Believe it or not I've seen this at my work place in US more than once. The only difference is that the building I was working in is probably not that tall. Otherwise, it was just a couple of guys on ropes (1 each) washing windows.
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