Renewable energies are not as inaccessible as some may think. Learning Energy is an interactive museum installation that educates its users on the process of using renewable energy sources to power small-scale physical-computing projects. Users can use a hand crank or shine a lamp over a solar panel to see how the power generated through kinetic and solar structures compare to the electrical power we generate through a plug.
The Screaming Sun is the result of a personal exploration into analog circuits, solar power, and music/noise generation. It's a musical/noise instrument that is electronic but has no batteries. It uses light to be powered. In addition, it also uses light to adjust the pitch of sound produced. The light that affects the pitch is literally the light of a mobile device's screen that can be manipulated by the composer using it.