An open dragon's egg.
the sight of it will be sure to keep you warm this winter.
When winter is nearing, I am reminded of old idyllic stories, telling about harsh winters and all the dangers outside.
It was told that a dragon's egg would keep you warm and safe through the long and cold winter.
Alas, it is modern times, actual dragons do not exist..
But.. with the help of 3d printing, we can at least get in touch with our imagination.