Why waste valuable kinetic energy created while leisurely rocking when you could power an OLED lamp while doing so? The OLED lamp even senses when it’s light or dark out, and if it’s light, stores the energy produced by rocking in a battery pack until nightfall. {via}
Rocking Chair that Generates Electricity from the Rocking Motion 1
Rocking Chair that Generates Electricity from the Rocking Motion 2