DORCAS BELLO, BIRD STORY AGENCY WHEN Jacob Onoja opens the door to welcome guests into his house in Jos, Plateau State, Nigeria, the first thing that catches one's eye are the exquisite paintings on the walls. This is an artist who lives and breathes art. "As far as I can remember, I have always loved scribbling, drawing, painting and visualising imaginary things in the sky. I did it in my teenage years, and I still do in my adult life," he said. Onoja only started to paint professionally in 1987 when he opened a studio, the Diadem Art Gallery. To…