This photograph taken on May 2, 2023, shows organic bread dough prepared to be cooked in the solar oven (Lytefire by Solar Fire), at the artisanal solar "bakery roasting", in Montville, near Rouen, northwestern France, on May 2, 2023. - The book "La boulangerie solaire - Un exemple pour un avenir radieux" (The Solar Bakery, an example of bright future) by Arnaud Cretot, French engineer, artisan baker, founder of Neoloco, co-founder of Solar Fire Concentration, was released on March 14, 2023. (Photo by Lou BENOIST / AFP)