WaterAid and Arup's drawing water challenge to find new ways to deal with water and sanitation issues has come up with some potentially winning ideas. The winning entry is 'WatAir' – a 96m, inverted pyramid array of panels that collects dew from the air and turns it into 48 litres of fresh water per day. Designed by a pair of architects, the implication of their scheme is that it could provide a constant supply of fresh water in polluted and remote areas in just about any climate.

Architect: Joseph Cory & Eyal Malka