Plato did not consider art useful. You can’t smoke the image of a pipe, or sleep in the image of a bed. The ‘real’ bed is the form that exists timelessly. The bed you sleep on is a copy or example of the real bed. A painted bed is even farther from the truth than the real bed - and in Plato’s view is dangerous because of that distance.
Rene Magritte’s ‘Betrayal of Images’ speaks to Plato’s argument. Below the image, Magritte has written ‘This is not a pipe’, as if to remind viewers that what is painted is not the real thing - that a space separates art and reality. Laurie Schneider Adams