After the printing process, you can have a solar module which could look like this ... It looks a bit like a plastic foil and actually has many of its features. It's lightweight ... it's bendable ... and it's semi-transparent. But it can harvest the energy of the sun outdoors and also of this indoor light, as you can see with this small, illuminated LED. You can use it in its plastic form and take advantage of its low weight and its bendability. The first is important when thinking about buildings in warmer regions. Here, the roofs are not designed to bear additionally heavy loads. They aren't designed for snow in winter, for instance, so heavy silicon solar cells cannot be used for light harvesting, but these lightweight solar foils are very well suited. The bendability is important if you want to combine the solar cell with membrane architecture. Imagine the sails of the Sydney Opera as power plants. Alternatively, you can combine the solar foils with conventional construction materials like glass. Many glass facade elements contain a foil anyway, to create laminated safety glass. It's not a big deal to add a second foil in the production process, but then the facade element contains the solar cell and can produce electricity.