Two generations of photographers, displayed side-by-side, powerfully capture the lively energy of West Africa. ‘Meeting at the Volta,’ at David Hill Gallery in London, features Sanlé Sory’s gentle studio-shot monochrome portraits of Burkina Faso in the 1960s-80s alongside contemporary photographer Kyle Weeks’ bold and colourful body of work, taken within the last six years on the streets of the Ghanaian capital Accra.