This is "one of the greatest things to have happened, not only to my art, but to Nigerian artwork", 93-year-old painter and sculptor Bruce Onobrakpeya says as he looks around the rooms at the Tate Modern, one of London's premier art museums. "The collection is fantastic and it brings back a lot of memories going back 50, 60, 70 years." Onobrakpeya is among more than 50 artists whose work is going on show at the gallery on the south bank of the Thames as part of Nigerian Modernism, an ambitious