LT, why don’t you take possession of the fish? Use it as your ownership of a piece of the old office. Transitional object perhaps.
My therapist moved offices in the middle of things. Honestly, it wasn’t that difficult to adjust to. I remember the first session in the new office he took me on a tour (the new office had room for more therapists, etc.) The only odd thing was for that first session there, his personal office wasn’t quite ready, so we used someone else’s. But his new office was fine.
Remember, he has to make it his own, and it may be configured a bit differently so things won’t be physically exactly the same.That’s to be expected.
But bottom line, the most important thing for me was that HE was the same. Our work continued. Our relationship was exactly the same. Sometimes it is important to remember what parts of that relationship are most important.
Some things change, but the foundation of your work will remain.