Water Machine was a giant gumball machine, of the kind familiar from newsagents and corner shops, which distributed globes of water if you insert the right money. Water is an increasingly scarce resource the world over, but there are few places that this fact is felt as keenly as Saudi Arabia. Primarily desert, the country relies on desalinisation plants to reclaim fresh water from the sea, an expensive and energy-hungry process. Sisters Noura and Basma Bouzo drew on this situation in their installation to highlight the need for a global structural change towards sustainable use of resources.