Studio Clash Wraps a White Steel Amphitheater Around Living Trees in Zibo

A tree is not a column, but it can hold a room together. In Zibo, a city in China's Shandong province, Studio Clash has built a compact amphitheater that does not compete with the landscape so much as wrap itself around it, literally threading white steel railings and tiered seating platforms through the trunks and root systems of existing toona sinensis trees. The result, called Circle Pit, is an installation that is at once a staircase, a stage, a gathering space, and a kind of monument to a species that carries deep cultural weight in the region.

Xiangchun, or toona sinensis, is one of those trees that anchors memory in Shandong. Its young shoots are harvested in spring and eaten as a seasonal delicacy, tying generations to a rhythm of anticipation and harvest. The decision to build around these specific trees rather than in an empty clearing is not incidental; it is the project's entire thesis. Lead architect Cohaul Guohao Chen has designed a structure that asks visitors to ascend into the canopy and inhabit the shade, converting the act of being near a tree into something participatory and communal. At just 50 square meters, Circle Pit is tiny by any measure, but its spiraling geometry makes it feel like an event.

A Helix That Listens to the Site

The primary formal move is a helical staircase that coils around a living tree trunk, ascending from lawn level to an elevated platform that sits roughly at the height of the lower canopy. The geometry is not arbitrary: the spiral widens and tightens to accommodate the actual positions of trunks, boulders, and root flares already on site. Where a conventional pavilion would have cleared the ground, Circle Pit negotiates with it.

Seen from a distance, the white steel form reads as a single continuous ribbon against the green lawn and the dense hillside forest beyond. Up close, it fractures into a series of discrete moments: open risers, tubular handrails, perforated mesh panels, and gaps where tree bark nearly grazes steel. The color choice, a flat white, keeps the structure from feeling heavy in the summer canopy while simultaneously making it unmissable as an object in the landscape.

Negotiating Rock and Root

The most telling detail in Circle Pit is how it handles the obstacles it chose not to remove. One image shows a tubular railing passing directly through the gap between a preserved boulder and a tree trunk, bending its path to accommodate the stone's profile. This is not ornamental sensitivity; it is evidence of a construction sequence that surveyed and adapted on site, adjusting geometry to what was already there.

The underside of the elevated platform reveals slender cylindrical columns that touch down lightly on the existing grade, minimizing the footprint of the foundations. The structure lifts itself above root zones, creating shaded space beneath the platform where visitors can duck and children can play. The relationship between the built and the natural is not one of frame and picture: it is more like a parasite and host, in the most generous ecological sense of the term.

Tiered Seating as Social Infrastructure

The stepped tiers that make up the upper portion of Circle Pit function as informal seating, turning the installation into a small amphitheater with the tree canopy as its ceiling. Families sit on the white treads, children stand at the railings, and the space operates without any prescribed program. There is no designated front or back, no stage and no audience: the concentric geometry makes every seat equivalent.

For a 50 square meter installation, this is a remarkable amount of social surface area. The tiered form multiplies the usable edge, allowing a dozen or more people to occupy the structure without crowding. It borrows from the logic of a Greek theatron but scales it down to something intimate, domestic almost, suited to the kind of slow weekend gathering that a park in a mid-sized Chinese city actually hosts.

The Stair as Experience

The act of ascending Circle Pit is choreographed carefully. Open risers mean you see the ground recede through the treads. The dual curving handrails provide a sense of enclosure without walls, and the staggered tread widths create a rhythm that slows the body down. You do not climb this stair quickly; you spiral, and as you spiral, the view rotates from lawn to stone wall to tree canopy to sky.

The handrails themselves are worth noting. Horizontal tubular steel bars, evenly spaced, create a visual screen that filters the surrounding landscape into strips. It is a subtle move, but it transforms the periphery into something cinematic, parceling the view into frames that shift as you move. For a structure built entirely from standard steel sections and painted white, the perceptual effects are surprisingly rich.

After Dark

Circle Pit becomes a different object at night. Cylindrical ground lights embedded beneath the elevated platform cast an upward glow through the open structure, turning the white steel into a luminous cage around the dark tree trunks. The perforated metal balustrades pick up the light and scatter it, and the spiral staircase reads as a glowing helix suspended in the darkness of the park.

The nighttime lighting strategy is restrained. There are no theatrical color washes, no spotlights aimed at the canopy. The illumination comes from below, mimicking the way streetlights or campfires throw light upward, and the trees remain dark silhouettes against the lit steel. It is an effective inversion: during the day, the trees are the dominant presence and the steel is secondary. At night, the structure asserts itself while the trees retreat into shadow.

Ground and Canopy

The relationship between the ground plane and the canopy is the real subject of Circle Pit. The structure mediates between these two horizontal registers, creating an intermediate zone, a kind of inhabited air, that normally belongs only to birds and branches. By placing human bodies at canopy height, Studio Clash makes the tree legible in a new way: not as a vertical object seen from below, but as a spatial field you occupy.

The distant views confirm that the installation sits gently in its context, a white ring on a green lawn backed by forested hills. It does not announce itself from far away. You have to walk toward it, and only as you approach does the spiral geometry and the interplay of steel and tree become apparent. This is the correct scale for an installation about proximity and intimacy with a single species of tree.

Plans and Drawings

The axonometric drawing reveals the full spiral logic: a continuous ramp that coils upward around a central planted core, widening into tiered seating platforms at its upper extent. People are scattered across the surrounding lawn, establishing the installation's intended role as a social attractor within a larger park landscape. The elevation drawing shows a pair of curved pavilions at different scales, each wrapping a large tree, suggesting that Circle Pit may be part of a family of interventions rather than a singular object.

The plan drawing is the most instructive. Concentric circles define the platforms, with stairs punching through the rings to connect levels. The central void is planted, not paved, and the tree trunk sits precisely at the geometric center. The precision of the concentric layout contrasts with the organic irregularity of the trees and boulders that the structure accommodates, and this tension between geometric order and natural disorder is what gives Circle Pit its visual energy.

Why This Project Matters

Landscape installations in China's mid-sized cities often default to one of two modes: monumental sculptures that ignore their surroundings, or decorative pavilions that flatten nature into scenery. Circle Pit does neither. It treats the existing trees as co-authors of the design, letting their positions, their root zones, and their canopy heights dictate the geometry of the steel structure. The result is an installation that could not be built anywhere else, because it is shaped by these specific trees in this specific ground.

At 50 square meters, Circle Pit is proof that small interventions can generate outsized spatial and cultural effects. Studio Clash has turned a regional affection for the toona sinensis into built form without sentimentality, creating a structure that elevates the body into the canopy and converts a passive relationship with a tree into an active, physical one. It is a project about looking closely at what is already there and building just enough to change how people see it.

Circle Pit by Studio Clash, led by Cohaul Guohao Chen. Located in Zibo, Shandong, China. 50 m². Completed in 2025.

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