Due to the many requests of a single person I added another thing that is not completely unlike a box:

This contraption is an end pin for a bass recorder. Well it is an end pin if you add the pin at the clamp on the right. Imagine a black, metal, telescopic mono pod - as you might use with a camera but a bit shorter (for some reason it did not make it on the pictures). May be at least adding the bottom piece of the recorder gives a better idea ...

Although these things are weird and serve a very rare purpose they multiply rather quickly.