Boys watch as artist Siya Mbola paints a mural of former South African president Nelson Mandela in Soweto December 9, 2013. More than 70 world leaders from U.S. President Barack Obama to Iran's Hassan Rouhani are flying to South Africa for events commemorating Nelson Mandela this week, an unprecedented gathering that will hail one of humanity's great peacemakers. REUTERS/Siphiwe Sibeko (SOUTH AFRICA - Tags: POLITICS OBITUARY)