Among the various items of Euclid Merch in the goody bag given to attendees at the annual Euclid Consortium Meeting in Rome are a nice bag, a cap, a notebook, and a mystery object:
Can anyone suggest what this item does?
(Wrong answers preferred.)

This morning, I took a short (~ 90 minute) flight from the pleasantly warm (23°C) Barcelona to the swelteringly hot (31°C) city of Rome. It’s actually forecast to be 39°C on Thursday and 40°C on Friday. Fortunately, I’m not staying that long!

The occasion for this trip is the annual Euclid Consortium Meeting, which is being held at the Università degli Studi di Roma “La Sapienza“. The main sessions are in the splendid Aula Maxima thereof, with its imposing mural:

I’m giving a talk there in the first plenary session tomorrow…
Update: here’s me giving my plenary talk:
