Soil naturally contains metals such as zinc, copper, and iron that are conducive to power generation, and microbial fuel cells (sometimes called earth cells) are capable of generating electrolytes in the soil to convert into usable energy. The soil lamp of Dutch designer Marieke Strap uses conductive plates made of copper and zinc buried in soil to provide LED bulbs with continuous and (almost) eternal light. Maintaining a soil lamp is as easy as watering a plant—as long as it is sprinkled with a little water to keep it flowing.

The soil light is commendable because it is simple and innovative, and all the components are contained in a transparent sphere. The metaphor of creating energy from the soil can be affirmed - as a free and abundant resource, garbage or soil everywhere can be obtained by almost anyone in the world, in the desert or in the city's garbage dump . Because of its naturally occurring electrical conductivity, the soil can easily generate energy, and as long as it is properly watered, this energy will support incandescent bulbs far beyond the life of the bulb.

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