This aerial view shows Arnaud Cretot, French engineer, artisan baker, founder of Neoloco, displays the organic bread from the solar oven on a counter top (Lytefire by Solar Fire), at his 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)