the caterpiller asked Alice. She did not have an answer for this, but here's a thought to do with ideas involving a telos: I did not make myself. I as a person have a telos. so somebody else concieved of my purpose. so 'my' purpose is the purpose someone made has for me that I through consideration of what I am have discovered. SO, if I were a chicken the farmer intended to roast, and I reasoned that, as I am a chicken, the farmer intends to roast me, so I ought to set about plucking myself, wringing my neck, gutting myself, and surrounding myself with potatoes and onions and such in a baking dish. AND such action is defined as 'good' and all others 'bad' or at the very least 'not good'.
As a result the writing desk, like the Raven, has a purpose that is outside of its own making. But I feel that I at least am capable of creating my own purpose and calling it good. and when one thinks of it this is what the chicken also does, because his purpose is decided on without consultation with the farmer who knows, and so it is pure speculation and thus not in accordance with, even if it is identical to, that telos which is given in the construction of the entity itself. And so neither the Raven nor the writing desk are capable of knowing the purpose for which they are made.