Why is it that what appeals to our imagination in poetry will not please our eyes when painted?

Page from "Letter on the Deaf and Dumb" which illustrates Denis Diderot's take on medium specificity

 

There is one page (above, [1][2]) in “Letter on the Deaf and Dumb” on which Diderot illustrates the concept of medium specificity down to a T.

At the top of the page is a musical composition represented by musical notation. Below that is a drawing of a reclining woman.

Both represent a dying woman.

Diderot answers the question “why is it that what appeals to our imagination in poetry will not please our eyes when painted?