An allusion can best be defined as

an explicit statement of fact
an unconfirmed piece of information
a symbolic statement
a subtle indirect reference

an allusion is a subtle indirect reference

in   ¨and yet the books¨   by czelaw miloz the tone is positive since it tells us that when we touch a book, it starts to live and the perspective is in the third person and turns once into the first person. in "the rhinoceros" by eugene ionesco the tone is illogical and absurd   and the perspective is in the third person since it is a play.