Assembly/​ Spherical Semaphore

UKR Ruhrding Silbersee2 2021 c Daniel Sadrowski 0759
UKR Ruhrding Silbersee2 2021 c Daniel Sadrowski 0778

Floating in the middle of Silbersee is an octagonal island made of wood covered with a roof of brightly-patterned cloth that is visible from far away. The platform, where tired swimmers can rest or people can engage in conversation, revolves around its own axis, depending on the strength and direction of the wind. With Assembly, as this work by Raul Walch (*1980) is entitled, the artist has installed a place of community on the open water. The word assembly has a dual meaning: an occasion for which people come together and the montage of different components.

Further away on the lake is where the windsurfers of TuS Haltern e.V. train. In co-operation with them, Raul Walch will produce a further project: for Spherical Semaphore the artist will paint the sails of their surfboards with coloured geometric patterns that clearly contrast with the usual sporting designs. As the surfers move, the painting will appear on the water in performative form.

Working with a range of textiles, their textures and how they behave in response to various contexts has been a focus of Walch’s work as an artist for many years. His flags on civic buildings or in abandoned areas, his sails mounted on boats that are inflated by motion and wind when these move across the water as well as similar to kites and other flying constructions, are both art and research objects at the same time. He is interested not only in their aesthetic and physical properties, but also their political significance.


In the wake of the ongoing pandemic, access to the Silbersee II and the Ruhr Ding: Klima artworks located there is not possible at this time. We will inform here as well as on all our communication channels as soon as the situation changes.


At the Silbersee II entrance fees are charged during the bathing season by our cooperation partner, the operating company Silbersee II Haltern am See mbH.


4,00 €

Children under 3 years:


Parking fee:

4,00 €


Currently closed


Silbersee II
Zum Vogelsberg
45721 Haltern am See


From Haltern-Sythen railway station it is about 15 minutes by bike to Silbersee II. By public transport, the lake can be reached by bus 273E. There are two car parks at Silbersee II, from both of which the artworks are within easy walking distance. There is an information point at the car park near Café Treibsand.

Raul Walch Künstler*in ©

Raul Walch

Driven by his political commitment, the artist not only wants to explore and comment on the world artistically, but also wishes to play an active role in shaping it.