A boy and a girl pose for a photo among the artworks by Nathan Sawaya in Johannesburg, South Africa, on April 6, 2015. The largest Lego artworks exhibition in Africa "The Art of the Brick", which shows more than 70 Lego artworks made by American artist Nathan Sawaya, are scheduled to be held here from April 3 to August 2, 2015. (Xinhua/Zhai Jianlan)