Member of the "Cercle et Carré", Marcelle Cahn's works from the first period are linked to expressionism thanks to her expressionist master Lovis Corinth in Berlin, then to cubism by joining the courses of the Modern Academy in the studio of Fernand Léger and Amédée in Paris where she did not go beyond abstraction, proposing a personal style combining geometric rigor and sensitivity, and finally purism and constructivism. After the War, she regularly participates in the Salon des réalités nouveles", where she shows her abstract compositions. It is at this time that she will define the style that characterizes her: paintings with white backgrounds crossed by a play of lines or forms in relief, it is also at this time that she realizes her astonishing collages created from everyday supports: envelopes, labels, photographs, postcards, stickers…