The art exhibitions in the Arithmeum mainly comprise constructivist art. The roots of this art form reach back to the early years of the 20th century. How much do we know about constructivist art, which is often described as being a purely rational or even mathematical art form? In programmes especially designed to match the current exhibition, we will explain the underlying concepts of the exhibited works of art. These concepts will be further illustrated by means of exercises enhancing the understanding of form, colour and composition. At the same time we will emphasize the fascination of this art form, whose simple structure comes to life through subtile nuances of form and colour and whose compositions frequently strive towards balance. The reduction of artistic media in this art form to bare essentials is often intuitively accessible to children.