Platoon unrelieved realism

Now I'm reading a book of David Hockney. 
He says that all of flat, 2D arts are what reality, 3D world translated. Of course there happens the gap and lag. The function and uniqueness of each art is how to fill it in.

The book said the Greek philosopher Plato didn't like the realism artworks.
These realism art had a great influence at that time too, and often used to cheat people.So he thought it is harmful.

Socrates said the similar thing too：
The pictures matter how it is seen, not actually what it is.
A branch in a water looks ｂend, but it is not the truth.
Those who draw knows our weakness and tries to deceive us.

At that time there was a realism painter Zeuxis who used a lot of techniques to paint a kind of trick art and made a big money. What Socrates said considered these situation.

I'd like to share what I thought interesting from this book.