Full Poem Text Available at http://books.google.com/books?id=9IAVAAAAYAAJ&pg=PR17&dq=william+blake+HE'S+A+BLOCKHEAD+WHO+WANTS+A+PROOF+OF+WHAT+HE+CAN'T+PERCEIVE&hl=en&sa=X&ei=tdZRUeDcGIqQ8wT-84DABA&ved=0CDcQ6AEwAQ#v=onepage&q=william%20blake%20HE'S%20A%20BLOCKHEAD%20WHO%20WANTS%20A%20PROOF%20OF%20WHAT%20HE%20CAN'T%20PERCEIVE&f=false |