In pictures: 11 eye-catching solar tech projects

From the world's largest solar furnace to a still that turns salt water into drinking water, the range of devices that harness the sun's energy is breathtaking. Here are some of our favourites

Clean water from clean tech Eliodomestico, a solar household still, was designed by industrial designer Gabriele Diamanti to provide people in developing countries with fresh drinking water. The still, which converts salt water into drinking water, works like an upside-down coffee maker. You pour water into the still through the top, and as the sun heats up the water, steam is forced down through a nozzle into the container below.

The simple yet elegant device can provide 5 litres of fresh drinking water each day and is made from widely available, inexpensive materials. A thoughtful touch: The bowl that the steam condenses into is made to carry easily on the user's head.

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