I found this mysterious object at an antique shop in London which I dropped in when I was a student.
Two wooden pieces are attached to a stick and can be rotated.
These pieces link as if they are bumping to each others, but they never do. This movement looks like somekind of engie,
and I imagine that it might be a archetype of some toy. But I still don’t know the answer.
Please let me know if you know what it is.
→ Finally, it became clear.
It is device designed by Archimedes for describing ellipses,
but it is also commonly made as a toy, known as a “Do Nothing Machine”.
Thank you for the information.
Trammel of Archimedes