This is poet, painter and all-around crazy guy William Blake's notebook. It is "a practical work book that Blake filled with sketches and drafts of poems." It is believed that he first used the notebook in February 1787. On the lower right corner of the first page, there's a poem with a vertical line through it. You poets out there may recognize it. It is called, "The Tyger."
Enlargement and front cover after the jump. So beautiful.