In French Gothic architecture, Rayonnant was the period between c. 1240 and 1350, characterized by a shift in focus away from the High Gothic mode of utilizing great scale and spatial rationalism (such as with buildings like Chartres Cathedral or the nave of Amiens Cathedral) towards a greater concern for two dimensional surfaces and the repetition of decorative motifs at different scales. After the mid-14th century, Rayonnant gradually evolved into the Late Gothic, Flamboyant style, though as usual with such arbitrary stylistic labels, the point of transition is not clearly defined.