When I'm cleaning windows

Including the basement, the Physics tower has 10 floors. Cleaning the windows in tall buildings isn't straightforward. I was in the right place at the right time to catch this agile chap as he cleaned the windows on the top floor. He even stopped and posed for me - what a lovely guy!

In case you need a reminder of how high up the top floor of the Physics tower is, see this blip which should give you a better idea of the perspective!

Edit to add: I modified the image to merge two images to make it look like there were two window cleaners - it's a bit of fun, but I think it looks quite cool!