I just found it and I can't help but writing about it: the article "Art of Africa" published by the Guardian. Here's a "sample":
Africa has created some of the greatest art that ever existed, and the brilliance of it has been known to Europeans for a long time. In the British Museum, there are ivory salt cellars carved by artists in the west African city of Benin for Portuguese trade in the Renaissance. The brass plaques that decorated the Oba's palace in Benin - which are also in the museum - with their snake-spirit soldiers and blocky, massive strength, were seen and admired by Europeans. The palace was even depicted in print in the 17th century. None of this prevented the British from eradicating the entire civilisation in a single bloody "punitive expedition" in 1897.
And another quote that expresses exactly what I think (I'm thinking it will be the conclusion to my All 55 African Countries project):
The worst thing about Africa is the waste - the millions of lives whose potential has no chance of being developed. And art is one way that talent can make its way.
And another: Art is as natural as breathing to the peoples of Africa. If there is ever another Picasso, she will be an African.
The article has been writen by Jonathan Jones, here's his short bio, also provided by the Guardian:
Jonathan Jones joined The Guardian in 1999. He enjoys contemporary and old art, and finds it hard to understand why the two are often seen as irreconcilable. He writes for art magazines including frieze, gives regular talks at Tate Modern including a series called Painting Bites Back, and recently wrote catalogue essays about Chris Ofili and Gary Hume. So he likes painting. Jonathan Jones is currently writing two books, one about Leonardo da Vinci, Michelangelo and the art of war, and second on the seductive art of Thomas Gainsborough. 
Detail of Les Demoiselles d'Avignon and African mask used by Picasso from the website of Bonnie Holt, teaching Art 107 at the College of Marin. Great Class, check it out. I particularly enjoyed the materials provided for the Bay Area Figurative Movement.