Not neccesarily, we could all be seeing different things, but if the meaning was fixed, that would lead to the conclusion that our realities are identical (which i am assuming they are here), not our minds. We could all see a quarter as being a different size from different, but it's actual size wouldn't vary. And you can figure out any object's actual size no matter how close or far it is if you know HOW close or far it is. Its real size is what you are seeing.
I completely see your point, and it is more than valid for practical purposes. I suppose my question is a thought-experiment. If all our individual concepts get their meaning from a network of such concepts, then none of us would have a priority on the real. (Not my practical opinion.)
To measure an object requires a mathematically or conceptual method. We can stabilize meaning in a book, but perhaps not as it is integrated into a living emotional sensual system of concepts.
---------- Post added 03-03-2010 at 11:37 PM ----------
How does a colorblind person have an identical reality to the rest of us? The idea of "red" or "blue" etc... are all the same to them, making their reality not identical to those who can distinguish between colors.
Yes! We can't forget that reality is qualia as well as concept. And that concepts exists as cells within a system of concepts, all meaning entangled save the most abstract, if not also this.
And "objectivity" is made of concept. Kant just can't; not really.