INVISIBLE CITIES X -- Cities and Signs: ZIRMA

"Zirma," courtesy
cittainvisibili.com

Zirma: I don't know.  There's nothing on it as a name.  I can find a couple sources that claim it as a city in Turkey, but Google Earth doesn't seem to know anything about; it suggest Szirma, Hungary.  Did Calvino make it up?

1. According to the last line, a thing only exists once it exists in the mind.  I guess that might be true, but it smacks of the whole "If a tree falls in the forest" thing.  Speaking of the last line, consistently it is the final words of a city's description that brings all the pieces together.
2. Couldn't the description of Zirma be used to describe anything, or at least any place?  I have the same problem with certain songs--can't ever get them out of my head without replacing them with something else.
3. How does Zirma work with or against Tamara, the other signs city?

This is such a different book from the others we've read.  I spend considerably more time researching and writing than reading.  It's refreshing!