What is great art?

Full many a gem of purest ray serene

The dark unfathom’d caves of ocean bear:

Full many a flower is born to blush unseen,

And waste its sweetness on the desert air.

(Thomas Gray)

A simple question: Does one have to be a famous artist to produce great art?

Picasso created this:

Toro by Picasso

It was duly eXtolled.

Now, what about this one?

by an anonymous wag?

sans commentaires

The above was on Facebook. It will be seen by a few hundreds, get a dozen “likes”. But should it be in a top gallery?

Salavador Dali made a sofa in the shape of Mae West’s lips. Clever we all admit.

But what about the above?