Here’s a toy that can serve as a child’s first introduction to the wonders of renewable energy.

Swiss toy-makers, Betrand and Masha Metrailler, create these nifty solar airplanes out of solid chestnut. When exposed to sunlight, or another strong light source, the propeller spins – the stronger the light, the faster it spins.

No batteries or switches to interfere with the toy’s performance. The Metraillers also make a solar helicopter.

This toy will cost you around $101 @ the BERTYandMASHA Etsy shop