Wired Science 12 January 2012.

We’ve all seen concentrated solar power (CSP) plants — those rows and rows of shiny mirror heliostats all crowded around a 100-metre-high pillar, like worshippers peering up at a towering god…
Mitsos and colleagues have come up with a new design for CSPs that reduces the required amount of land while boosting the amount of sunlight the heliostat mirrors collect. In perhaps the most beautiful example of biomimicry yet, it’s inspired by sunflowers…

http://www.wired.com/wiredscience/2012/01/sunflowers-solar-energy/