About 15 years ago, when I was on holiday with my wife in Malta, we visited Fort Rinella (1000 ton gun) where I bought a small, hollow porcellan replica of the shell with a slit, that could be used as a money saving box. Because the hollow porcellan body was fragile, I rolled it up in a towel and put it in my hand luggage. When my bag went through x-ray at the airport, suddenly everything went quiet. The shape of the object was enough to get everybody highly upset. Not even the colour (density) of the object on the screen, made them think. When the inspecting officer held up the object, with the golden inscription on it, you could see the mental release in the faces of the personnel around.
Bellifortis.