Opera by the Sea Estonia: Three Shells Dissolving Architecture into Tallinn's Coastline

What happens when an opera house refuses to be a building? On Tallinn's waterfront, three curved shells spread horizontally across the landscape, creating a structure that reads as geological formation from the sea and as parkland from the city. The distinction between roof and ground, interior and exterior, architecture and landscape is deliberately collapsed. Visitors walk across the building as easily as they walk through it, and the Baltic coastline becomes not a backdrop but a co-author of the spatial experience.

Designed by Action Liu and Guangzhou Jiansu Architectural Design, this proposal was selected as the Winner of the Opera by the Sea competition. The project's core provocation is simple but potent: an opera house conceived as being steady like a mound while appearing to float like a vessel. Rather than competing with the existing Linnahall Arena through height or visual dominance, the design follows a similarly horizontal logic, its broad, gently curved surfaces extending outward toward the waterfront to preserve Tallinn's low skyline.

Smooth Geological Forms Along the Shoreline

From across the water, the opera house registers as a series of smooth white formations resting along the shore, their silhouettes low enough to defer to Tallinn's established skyline. Under dark storm clouds, the shells gain a sculptural weight that roots them to the site. At dusk, the same forms glow from within, their illuminated ramps drawing figures upward and outward across frozen wetlands. The building is simultaneously monumental and restrained: its scale is undeniable, but its posture is horizontal, spread rather than stacked.

This landscape-driven character is the project's defining move. Roofs become paths, terraces become gathering places, and edges gradually merge into the surrounding park. A landform park creates a continuous transition between the southern urban edge, the opera house and the waterfront, with vehicle circulation largely concealed within the landscape strategy. The result is that the building never terminates at a conventional façade; it simply dissolves into terrain.

A Starry Dome and the Principal Auditorium

Inside the largest of the three shells sits the principal auditorium and stage complex. Layered balconies wrap the circular performance hall in tiers, creating an intimate yet grand enclosure. Above, a domed ceiling pierced with points of light evokes a night sky, collapsing the boundary between the interior world of opera and the vast Baltic landscape outside. The geometry here is precise: the circular plan concentrates acoustic and visual focus on the performers while the dome lifts the audience's gaze upward, reinforcing the sense that the building is as much about atmosphere as it is about programme.

Outdoor Performance Framed by the Sea

The sweeping roof of one shell peels open to frame the ocean, creating a wide stepped seating area that functions as an outdoor performance venue. Audiences gather on broad terraces with an uninterrupted view of the Baltic, and the architecture acts as a proscenium for the horizon itself. This space captures the project's argument at its clearest: the opera house is public infrastructure, not a sealed cultural monument. Performance extends beyond the auditorium walls, and the city is invited in without a ticket.

Interior Corridors as Rehearsal and Spectacle

The overlapping geometry of the three shells produces connecting spaces that are far more than circulation. Angled white columns support a curved ceiling above polished floors where dancers rehearse in full view of passing visitors. The intermediate shell, which forms much of the public circulation and connecting space, turns movement itself into a kind of performance. Courtyards, openings, terraces and protected exterior areas emerge between the major programmatic zones, ensuring that visitors are continuously encouraged to circulate between interior and exterior conditions.

A Roof You Inhabit

Seen from above, the opera house reads as a cluster of interconnected organic forms rather than a conventional rectangular cultural building. The white roof landscape, with its undulating surfaces and stone paving, becomes the project's most generous public gesture. Visitors walk and gather across the building's upper surfaces as if traversing a sculpted park. The accessible roof landscapes, along with promenades and green areas, are integral components of the architectural experience rather than afterthoughts. The smaller shell houses cultural and hospitality functions including a museum and restaurant, so even the roof promenade has destinations embedded within it.

The three-shell strategy allows each part of the building to respond independently to its function while maintaining a common architectural language of curved, flowing surfaces. From this vantage, the project's connection to the existing Linnahall within a larger green system becomes legible: the opera house is not an object placed on the waterfront but a thickened piece of ground that stitches city to sea.

Why This Project Matters

Opera houses carry an outsized symbolic burden. They are expected to announce civic ambition, to signal cultural sophistication, to dominate a skyline. Action Liu's winning entry resists every one of those expectations. By choosing horizontal spread over vertical assertion, by making the roof a public park and the shoreline a stage, the design argues that a cultural building can be generous without being grandiose. The deliberate tension between solid and fluid, enclosed and accessible, is not a formal gimmick; it is a spatial strategy that makes the opera house belong to the city rather than merely standing in it.

The project also offers a thoughtful model for how contemporary architecture can engage sensitive coastal sites. Tallinn's waterfront demands restraint, and the low-profile shells deliver it without sacrificing ambition. By integrating pedestrian circulation, landscape, outdoor performance and cultural programming into a single continuous surface, the proposal suggests that the most powerful cultural landmarks may be the ones you can walk across without realizing you have entered a building at all.

View the Full Project

About the Designers

Designer: Action Liu

Enter a Design Competition on uni.xyz

uni.xyz runs architecture and design competitions year-round that reward proposals with spatial conviction and real site intelligence.

Project credits: Opera by the Sea Estonia by Action Liu Opera by the Sea (uni.xyz).