Yes, but what is it?

What is the subject of the photograph? Is someone walking over my grave, (assuming I had a glass coffin lid)?

In fact it's someone walking over a glass rooflight/ smoke vent which allows a dim stream of daylight into the tunnel connecting South Kensington underground station with the Victoria & Albert Museums, Natural History Museum and Imperial College.



I was walking through the tunnel on my way to Kensington Gardens and a visit to the Serpentine Gallery- one of my favourite art galleries in London.