'To see the world in a grain of sand, and to see heaven in a wild flower, hold infinity in the palm of your hands, and eternity in an hour' William BlakeWilliam Blake was a poet and artist. Born in Soho in the eighteenth century, the son of a shopkeeper, he is now acclaimed as a radical left-field artist. Most recently, the Tate held an exhibition of his work: 'Magnificent ... reveal's Blake's vision at its most vivid and strange' GUARDIANBlake's written work was equally vivi