It's a strong and striking idea. How would the public put 30,000 bananas in context? Do they think of global food issues? What happens when people come up and help themselves to the bananas?
There's also the story of Nigerian films. He had noticed there were plenty of Nigerian films in his newsagent, but they were full of black people. So he went to Nigeria and talked himself into a Nigerian film.
The obvious analogy would be to a version of Othello where the entire cast is black, except for Othello, who is white.
Fishbone says that he doesn't necessarily come up with any brilliant new ideas, but he does follow through on the ideas he has.