What puzzles me is Socrates refers to listening to an oak (tree) or even a stone, but dismisses the possibility of the same from a painting. What does he even

What puzzles me is Socrates refers to listening to an oak (tree) or even a stone, but dismisses the possibility of the same from a painting. What does he even mean by listening to an oak? To my 21st c. ears, it is much more sensible to talk of listening to a text as if the author were really here, howsoever remote the text or the author be, than listening to a stone.