Hi,
Thanks for your thoughts on this!
I have changed or added some tags to achieve a better understanding.
This is a dedicated work of Kinetic art in which movement is an integral aesthetic component. Movement cannot be separated in kinetic art. If movement is missing, then the work of art is destroyed. This is the case here: Due to the lack of water, the rotors do not rotate. It is a modern art fountain ruin.

Describing the object as a broken work of art does not seem appropriate to me. For example, disused:art_work or abandoned:art_work do not fit in my opinion. Tagging with historic such as historic=yes, historic:art_work, historic:amenity or historic:fountain would also be unsuitable.

Officially, the object is referred to as a fountain, including in Wikipedia.

The term "fountain" does not refer exclusively to the function of carrying water, but also to the structural design and the historical or cultural significance and the artistic intention.
A classification as a broken work of art would therefore be misleading and also completely unusual in OSM.
The classification as a broken kinetic art fountain comes closest to describing the object.
That is why the term "fountain" is still the best solution.

Regards,
Kartibu