Is there a name for knowing something is gone but not remembering what it was?
Sometimes I'll notice that a building that I used to drive by all the time is gone (leveled to the ground). I know it's gone, but I can't remember what it looked like or what was in it. I just know it's gone.
There's probably some really specific word in German for this, but I can't think of a single word in English that would fully describe what you're talking about.