I say: “There is || There's a chair over there”; what if I walk over to it and want to take it || fetch it and it suddenly vanishes from my view || sight? – “Then it wasn't a chair, but some illusion or other.” – But in a few seconds we see it again and can take hold of || touch it, etc..– “Then || So the chair was there after all and its vanishing || disappearance was some sort of illusion.” – But suppose that after a time it disappears again, – or seems || disappeared again, or seemed to disappear. – What ought we to say? now¤ Have you got rules ready for such cases, which say whether one may still call such a thing || such a thing is still called a “chair”? But are they lost to us in our use of || do we miss them when we use the word “chair”; and ought we to say that we really attach no || don't attach any || a meaning to this word, since || as we are not provided with rules for all the possibilities of its application?