Watching the watchers: Hajra Waheed turns the table on the spooks

No one knows what Saudi Aramco is worth. Oil and gas experts estimate Saudi Arabia’s state-owned energy giant could be worth “trillions of dollars”, making it easily the world’s biggest company. But Montreal-based artist Hajra Waheed, who has solo shows in The Mosaic Room in London (Sea Change, until 21 May) as well as the Baltic Centre for Contemporary Art in the north of England (The Cyphers, until 30 May), knows more than most about the ultra secretive company. She gr