Swing low ...
Note that these photos were taken through our tinted windows, which gives a blue cast. Maintenance work is happening on the West face of our building. Today we found some workers passing by the Winter Garden. One of them paused, apparently observing a colleague lower down. He had a lot of kit around his belt. I went down to the garden area on level 1 to look up. ('Our' guy had descended a few floors by then.) A close up of the 2 guys on the left. A little later I went out, and saw the blokes up on the roof with the gantries they swing off. They were back on 8 April. In the first 2 images they are wrapping a canvas (or similar) sheath around their rope to protect it where it runs across a balcony. Looking down: if I was working in this position I also would not want the rope to fray.