... solar films on buildings with enough left over to feed a surplus back into the grid. Tomáš J. Fülöpp 20071113: I expected something very similar to this. I thought bricks (or other construction materials) could be mass made with photovoltaic capabilities. they'd be modular, so large walls would produce more energy. and they could be cheap, because even low efficiency technology would be enough to provide enough energy.. Happy! Future, come!