Some croissants are straight while others are crescent shaped…. but does it MEAN anything, or is it just decorative? Turns out France actually has laws about what each shape indicates. According to Everywhereist, in France, only all-butter croissants are legally allowed to have a straight shape (as seen below)! Any croissant, even those made with part margarine or other oils, can be crescent shaped. There’s your strange fact for the day.