Ib Geertsen (1919 - 2009) is considered to be one of the most important Danish representatives of Concrete Art, an art movement that is based on mathematic and geometric principles.

His work anticipates trends in contemporary art, ranging from painting to sculpture and work in public spaces, and comes under the same umbrella as Serge Poliakoff or Alexander Calder.

Geertsen’s mobiles, which he himself called “aerial drawings”, are playful, using his characteristic colorful shapes. Balance, movement, light and air find a poetic expression in his creations.

Ib Geertsen was born in 1919 and was active for over 70 years until his death in 2009. In the last four decades of his life, his work expanded to include mobile sculptures, screen printing, furniture and public design projects. Throughout his career, Geertsen followed his very personal vision of concrete - or geometric - abstraction with his own distinctive exploration of shapes and color combinations.

Generations of Danish artists have grown up with his colorful formalism in museums and public spaces. Geertsen originally trained as a gardener and was self-taught as an artist. Between 1943 and his death he exhibited in all the major museums in Denmark and in 2003 he had a retrospective at Kunsthallen Nicolaj, Copenhagen which led to renewed critical attention.

In 2008, Geertsen's work was included in the group show Danish Konkrete at Rocket.