Water has a tendency to adopt a convex form as you can see to a water drop. It tries to maintain a spherical form, but because of the gravitation it does not succeed. In a flat surface the convex form is reduced to a circle. For this reason the river winds its way through the landscape. The groynes in the river reduce the different movements to one main stream. Near the groynes the whirling movement of the water is the most visible, because they dam the flow. My intention was to make this whirling of the water stream visible in a vertical moving construction.