"Turn, please, to the introduction and read what Imago has to say on the matter of dream interpretation. Then, divide into pairs. Use The Dream Oracle to interpret each others most recent dreams. Carry on."
-- Sybill Trelawney (OP12)
Inigo Imago was the author of the book The Dream Oracle which is used as a textbook in fifth year Divination class at Hogwarts (OP12).
"imago" = an idealized image of someone, formed in childhood and persisting in later life, from L. imago = image
The name Inigo sounds similar to the word "enigma" which means something, often a person, which is a mystery or a puzzle.