Ceramic shoes in various designs are from Palazzo Davanzati museum in Florence,
they are a very rare collection of 17th century hand warmers in the shape of shoes.
I had never seen such a thing, and decided it might be a good Antique Guessing Game.
Online I found this one at Arbatel Antiques, though it has sold.
As you can see from the image via Arbatel Antiques, the spout to add the hot water.
Popular ceramics, Slipper-shaped hand warmers, 1680-1720, manufacture of Ariano Irpino, Campania (Palace Museum.
A humbly dressed woman warming her hands over a brazier- Maestro della Tela Jeans
Thank you for all the creative and wonderful guesses, I appreciate your efforts and humor.
The first one to say it was a hand warmer was:
You tell me who out of the comments below do you find the most creative: