Sonia Delaunay is one of the most important artists of the early twentieth century, whose contribution to European Modernism was fundamental, if not always fully acknowledged in its own right. She is known for translating her experiments via painting into the realm of fashion, interior design and crafts and, thus, consciously transcending the boundaries between fine and applied art. The focus within mainstream art history has been her relationship with her husband Robert Delaunay. Tom Sandqvist shifts this focus on her Jewish roots and sheds a light on the influence of growing up in the typical Eastern European shtetl, which has not attracted any special attention in the analysis of Delaunay’s art. Tom Sandqvist reflects on the impact of Judaism on Sonia Delaunay’s œuvre, with a special focus on her early contributions to Simultanism and Orphism within the interwar Parisian Avant-Garde.