THE artist El Anatsui was born in Ghana and has spent the bulk of his career in Nigeria, but is a citizen of the world. News of a major new installation of his work coming to the prestigious Tate Modern gallery in London is just one in a string of major international exhibitions and awards in the past decade. Author AMUCHE NNABUEZE, Lecturer in Art and researcher, University of Nigeria The 79-year-old artist has become so renowned that in art circles his brand of work is a kind of art movement with its own name, Elism. His work is influenced…