You don’t get a much more appropriate use of technology than this booklet for Austria Solar. Using ink that remains invisible until sunlight touches it, this crisp design by Mathias Nösel and Matthäus Frost of Serviceplan, comes in a foil envelope only revealing its imagery when opened to the rays of the sun. It’s a lot like those 1990s shirts that exposed their sweet prints as you strolled outside… only this is a whole lot less cheesy.

Clearly, what makes this so incredibly appropriate is the way the design reveals the suns power to each recipient, showing in a very tangible way the energy the sun is bathing us in at every moment. It’s the perfect message for a solar company looking to show how much freely available power is available for the taking.

As the video below demonstrates, it only takes a matter of seconds for “The Solar Annual Report 2011″ to reveal the images inside its neatly embossed cover. The designs are simple and clear, even in the light pastel-colored inks, putting a heavy emphasis on typographical elements and clear representation of data. You can find out more about designers Mathias Nösel and Matthäus Frost on their Behance pages.