Lars-Gunnar Nordström came to Paris in 1949 and there came into contact with the paintings of Magnelli, Jean Dewasne, and Vasarely. Through this discovery, he also found the Nordic contemporary artists from Scandinavia; Robert Jacobsen, Richard Mortensen, and Olle Baertling. Inspired by their non-representational painting, he began to paint geometrically with contours whose lines were straight, like sharp edges, with angles, arcs, curves, circular forms, squares, rectangles, and triangles.

His first solo exhibition was held in Helsinki in 1949, where his concrete, constructive painting with smooth-painted surfaces attracted interest. Ripolin paint gave his surfaces a sheen with reflections.

During a trip to the USA, he came into contact with Josef Albers' colour treatment and his theoretical work "Interaction of Color," which subsequently influenced the way Op Art became crucial for concrete art. In the USA, he also discovered the paintings of Alexander Calder and Stuart Davis, whose reliance on the impact of colour on the environment intrigued him. Within Nordic concrete art, Nordström became important as a pioneer and influencer in his surroundings.

Like Baertling, he highlights three-dimensional forms and sees the dynamic in colour as affecting the viewer. Together with Auguste Herbin, Robert Jacobsen, Richard Mortensen, Olle Baertling, Gorin Magnelli, Josef Albers, and Jean Dewasne, he belongs to the true pioneers of concrete art and renewers of art in the 1950s and 60s.