'African classical art' - Inside the Kingdom of Ife

In the Guardian, art of the Ife Kingdom:

This is an exceptional exhibition, even by the high standards the British Museum has established in recent years. It is extraordinary because it brings together such a large number of masterpieces that have rarely or never been exhibited outside Nigeria before – and when I say masterpieces, I mean artworks that rank with the Terracotta Army, the Parthenon or the mask of Tutankhamun as treasures of the human spirit.
For European artists a century ago, African sculpture was powerful precisely because it did not conform to the smooth idea of beauty that Picasso's generation had been brought up on – ideas that went back to classical Greece. But they had not seen the art of Ife, a medieval city state that flourished from the 12th to 15th centuries in West Africa, trading across the Sahara with the Islamic Mediterranean world.