 Being the same size as is an equivalence relation that holds contingently. What does it take for that relation to hold contingently between the table in the next room and my favorite table? Thinking in terms of possible worlds the table in the next room is contingently the same size as my favorite table just in case the following is so. The table in the next room is the same size as my favorite table, but, in some possible world W, something identical to (or a counterpart of) the actual table in the next room is not the same size as what is actually my favorite table.