The Opposite Sphere (Rostbollen)

Origins and makers

The Opposite Sphere is a collaborative public sculpture conceived by the Luleå artist collective Kilen and installed in the late 2000s; credited makers include Jan‑Erik Falk, Eva Gun Jensen, Dan Lestander and Ricky Sandberg. The work was commissioned as part of the municipality’s programme of public art to give visual identity to an entry point of the city. Built from corten steel, the piece deliberately uses a rusted surface to anchor the object in the region’s industrial narrative and shoreline weathering processes.

Scale and material presence

At roughly eight metres across and weighing close to twenty tonnes, the sphere is both monumental and elemental. Its thick weathering steel shell develops a deep orange‑brown patina that changes gradually with seasons and light; from a distance the sculpture reads as a warm orb against the pale Arctic sky, while up close its textured plates, seams and subtle paneling show the human craft behind the mass.

Site and spatial conversation

Sited within a roundabout at Notviken, the sphere engages in a sculptural dialogue with its surroundings rather than sitting within a traditional park. It forms a focal point for passing traffic and the coastline beyond, visually connecting the built environment with Luleå’s maritime edge. The compact, engineered setting emphasises the object’s geometry: when approached from different angles the silhouette and reflections shift, so each viewpoint reads as a new composition.

Symbolism and local meaning

Locally nicknamed Rostbollen, the work references regional steelmaking and the patina of time; its oxidised surface is a deliberate aesthetic and symbolic device, suggesting endurance, transformation and the interplay of industry and nature. The sphere’s simple, almost archetypal form invites multiple readings — from planetary to industrial — and its presence in the entry landscape signals a civic willingness to place contemporary art in everyday urban infrastructure.

Experience and sensory notes

The sculpture is best appreciated through close visual study and photographic exploration. In low winter light the rust tones deepen and the form becomes monumentally graphic against snow and pale skies; in summer the warm metal picks up long‑angled sunset hues. There’s no formal enclosure: the sculptural voice is provided entirely by scale, surface and situation, so the soundscape of traffic, wind and sea plays as part of the encounter.

Conservation and construction details

Constructed from corten (weathering) steel, the sphere’s finish is intended to be stable and low maintenance, the patina acting as a protective layer once established. The sculpture sits on a prepared base within the roundabout and was engineered to withstand coastal winds and freeze–thaw cycles. As public art located in the municipal right‑of‑way it forms part of Luleå’s managed outdoor collection and is visible year‑round without admission or restricted hours.