” And then I change those other pieces, just as all the atoms in our cells are replaced, so you have a chair that looks somewhat like the first one - some of the writing is the same on it, but there is much more and what is the same has been recopied on the new wood - but is larger, slightly differently shaped, shares a statistically insignificant % of atoms with the original, is less flexible but can now seat two people. This is the same chair? Do you realize I could have reassembled all the pieces of the orignal chair in another room, without telling you? So now we have two chairs you say are the same? OK, I responded, but from now on, another thread. I'll be good.