Why is a Raven like a writers desk?

Why is a Raven like a writers desk?

if a Raven were ever thought of so

would it be the raven is like the desk 

or the desk like the raven

maybe even the knowledge even associated  

with the desk. but a Raven is a clever bird

maybe the raven is more like the wisdom 

from working at such a desk

but a writers desk is just a desk 

and the words written come from the person

not the tool. the tool only helps one such wise person

so the Raven is a wise knowledge seeking individual

and is associate's with the writers desk. or is it the other 

way around and the raven is being thought about and

written about or maybe the raven is used as a tool 

in some manor.  

Why is a Raven like a writers desk?

is there any answer at all 

there is no answer for the bird didn't call 

and the desk wasn't written on 

and the author didn't say

so maybe the Raven is not as important 

as the question itself 

that the desk and the raven are just that

Part of the story.