Interior Architecture of The Mukaab — Spiraling Atrium Tower, Holographic Dome, and Spatial Design

Interior Architecture: The Spiraling Tower Within the Cube

The Mukaab’s interior is dominated by a central architectural feature unlike anything in existing buildings: a spiraling tower encased within the cube’s volume, rising through a vast atrium fitted with a holographic dome. This interior tower serves as the structural spine of the building’s immersive experience, carrying residential, commercial, hospitality, and cultural functions in a vertical helix that creates dynamic spatial relationships between occupants at different levels and the dome’s holographic projections above. Understanding this interior architecture is essential for prospective residential buyers because it defines the living environment, the views from interior-facing units, and the spatial character that distinguishes Mukaab residences from every other building on earth.

The Central Atrium: The World’s Largest Enclosed Volume

The atrium at the heart of The Mukaab represents one of the world’s largest enclosed volumes — a space within the 400-meter cube where the full height, width, and depth of the structure create a void of staggering proportions. To contextualize: the interior volume of The Mukaab (approximately 64 million cubic meters total) dwarfs that of any existing building. Even accounting for the floor plates, structural elements, and the spiraling interior tower that occupies portions of this volume, the remaining open atrium space exceeds anything achieved in architectural history.

Within this atrium, the holographic dome creates artificial skies that can shift between blue daylight, sunset gradients, starfields, and surreal scenic vistas — transporting occupants into environments that transcend the physical reality of being inside a building in northwest Riyadh. The dome’s outer surface is fitted with cutting-edge holographic and VR projection systems capable of rendering photorealistic environments at architectural scale. This technology transforms the interior of the building into what the developers describe as a “gateway to another world,” where the boundaries between physical architecture and digital environment dissolve.

The atrium is not a single open shaft but a structured spatial composition with multiple zones at different heights. Interactive indoor gardens occupy platforms and terraces at various levels, creating green oases within the technological environment. Art installations — both physical sculptures and digital projections — populate the atrium’s vertical layers, creating a continuously evolving aesthetic environment that changes with programming, season, and time of day. Cultural venues, including a technology-powered museum and immersive theatre, occupy dedicated zones within the atrium, providing anchor experiences that draw residents and visitors into the shared spaces of the building.

The Spiraling Tower: Vertical Architecture Within Architecture

The spiraling tower that rises through the atrium is the structural and experiential centerpiece of The Mukaab’s interior. Unlike the straight vertical cores of conventional buildings, this tower follows a helical path as it ascends through the cube’s interior, creating a dynamic spatial relationship between the tower’s occupants and the surrounding atrium. As residents or visitors ascend the tower, their orientation to the atrium space shifts continuously, providing changing perspectives on the holographic dome above, the gardens below, and the multiple levels of activity throughout the void.

The tower carries multiple functional programs stacked vertically: residential floors with units facing both inward (toward the atrium) and outward (toward the Riyadh cityscape through the Najdi-inspired exterior screen), commercial office spaces, hospitality floors with hotel rooms and suites, cultural venues, observation decks, and dining facilities. This vertical mixing of uses within a single architectural element creates a micro-urbanism within the building — a vertical neighborhood where residents can access work, dining, entertainment, and leisure by moving vertically rather than horizontally.

The spiraling form also serves structural purposes. The helical geometry distributes loads more evenly than a straight vertical core would, reducing stress concentrations and providing structural redundancy. The tower’s connection points to the four corner anchors via the floor plates and sky bridges create a three-dimensional structural web that contributes to the overall stability of the cube.

Sky Bridges: Horizontal Movement Across the Void

Sky bridges connecting different zones within the structure provide horizontal movement across the atrium void, creating pedestrian pathways suspended above the interior landscape at multiple levels throughout the building’s 400-meter height. These bridges serve both functional and experiential purposes that distinguish The Mukaab’s interior from any existing development.

Functionally, the sky bridges connect residential clusters to amenity zones, allowing residents to walk from their apartments to dining, retail, fitness, or cultural facilities without descending to ground level and crossing the building horizontally at the base. This three-dimensional connectivity creates a walkable vertical neighborhood where the concept of a fifteen-minute city operates not just horizontally but vertically — residents can reach essential services and amenities within minutes regardless of which floor they occupy.

Experientially, the sky bridges provide some of the most dramatic spatial experiences in the building. Crossing an open void that extends hundreds of meters vertically, with holographic projections shifting above, sky gardens visible below, and the spiraling tower visible in the middle distance, the bridges offer a spatial experience that exists nowhere else in architecture. The psychological impact of moving through a space of this scale — enclosed within a building yet surrounded by vast open volume — creates an environment fundamentally different from both outdoor urban spaces and conventional enclosed corridors.

The sky bridges vary in character depending on their location and function. Bridges connecting residential zones may be enclosed, climate-controlled corridors with glazed walls offering panoramic views of the atrium. Bridges serving amenity destinations may incorporate retail, cafes, or viewing platforms. Upper-level bridges near the observation decks may be partially open to the atrium environment, providing the most immersive spatial experience.

Vertical Transportation: Moving Tens of Thousands Through 400 Meters

The vertical transportation system addresses one of The Mukaab’s most demanding engineering challenges: moving potentially tens of thousands of people vertically through a 400-meter structure efficiently, safely, and without creating bottleneck congestion that would degrade the living experience. The challenge is compounded by the building’s multi-use programming — residents, hotel guests, office workers, retail shoppers, museum visitors, restaurant diners, and observation deck tourists all require vertical movement through the same structure, often during overlapping peak periods.

High-speed elevator systems, potentially incorporating magnetic levitation technology developed for modern supertall buildings, would provide rapid transit between floors. The elevator system would likely employ a zoned approach similar to that used in the Burj Khalifa and other supertall buildings: express elevators carrying passengers to sky lobbies at various levels, from which local elevators distribute passengers to individual floors within each zone. This approach reduces the number of elevator shafts required to penetrate the full height of the building, freeing floor space for occupied uses.

The elevator system design must account for several factors unique to The Mukaab. The cube’s width and depth — 400 meters in each direction — mean that horizontal distance within the building is as significant as vertical distance. Residents on the 60th floor of one corner anchor may need to travel vertically down, horizontally across, and vertically up again to reach a destination in another corner anchor. The sky bridges provide horizontal connectivity at upper levels, but the elevator system must be designed to minimize total travel time for the most common journey patterns: home to ground level, home to amenity zone, home to parking, and home to observation deck.

Emergency evacuation planning for a structure housing tens of thousands of occupants at heights up to 400 meters requires redundancy in vertical transportation, pressurized stairwells, designated refuge areas at multiple levels, and coordination with the smart building technology systems that monitor occupancy patterns and can direct evacuation flows based on the specific location and nature of an emergency.

Interior-Facing Residences: The Unique View Proposition

For residents of interior-facing apartments, penthouses, and sky villas, the atrium is the primary view — a living, breathing technological landscape that no exterior view from any building can match. While exterior-facing units in The Mukaab offer panoramic views of the Riyadh cityscape through the building’s triangular screen, interior-facing units offer something unprecedented: views into a controlled, programmed, ever-changing environment that combines natural elements (gardens, water features, planted terraces) with technological spectacle (holographic projections, digital art, dynamic lighting).

The view proposition for interior-facing units is fundamentally different from the static cityscapes or landscapes visible from conventional luxury apartments. The atrium environment changes throughout the day, with different holographic programs running at different times. Seasonal programming could transform the atrium from a tropical garden atmosphere to a winter wonderland to an abstract digital art installation. The view from an interior-facing unit is not a fixed feature but a living amenity that evolves over time — providing a visual experience that never becomes routine.

This architectural proposition has implications for unit pricing. In conventional buildings, the highest-value units face outward toward views — water, city skyline, parks. In The Mukaab, the value calculation may invert for certain units, with interior-facing residences commanding premiums based on the unique atrium experience. The interior design standards for these units — including smart glass windows with adjustable opacity, floor-to-ceiling glazing, and climate-controlled environments — are designed to maximize the relationship between the residence and the atrium view.

Indoor Gardens and Biophilic Design

The integration of indoor gardens at multiple levels within the atrium reflects the growing body of research on biophilic design — the principle that human wellbeing is enhanced by proximity to natural elements. Within The Mukaab, these gardens serve multiple functions: they provide the green environment that counterbalances the technological intensity of the holographic dome, they contribute to indoor air quality through natural oxygen generation and particulate filtration, they create social gathering spaces where residents encounter each other informally, and they provide visual interest and variety within the atrium landscape.

The gardens would include botanical collections curated for both aesthetic impact and climatic appropriateness. While the controlled interior environment of The Mukaab allows for plant species that could not survive in Riyadh’s external climate, the design philosophy emphasizes connection to the Saudi landscape through incorporation of native and regionally appropriate species alongside international specimens. Vertical gardens on the interior surfaces of the cube’s structural elements extend the green presence beyond the horizontal garden platforms, creating living walls that contribute to the building’s air quality and aesthetic character.

The sky gardens accessible to residents include not only the atrium gardens but also rooftop gardens atop The Mukaab, landscaped terraces at multiple levels, and the podium gardens of the surrounding residential district — together creating a three-dimensional network of green spaces that extends from ground level to 400 meters above the Riyadh desert. ### Acoustic Design: Managing Sound in the World’s Largest Interior

The acoustic environment of The Mukaab’s interior presents challenges with no precedent in architectural acoustics. The central atrium — an enclosed volume of potentially millions of cubic meters — would, without acoustic treatment, produce reverberation times measured in tens of seconds, creating an uninhabitable sonic environment. Sound generated at one level of the atrium — conversation, footsteps, music from entertainment venues, mechanical noise from elevators and HVAC systems — would propagate throughout the volume, creating a cumulative noise level that would be incompatible with residential living.

Acoustic design solutions would include sound-absorbing materials applied to the atrium’s surfaces (the interior faces of the cube’s walls, the underside of floor plates, the surfaces of sky bridges), acoustic barriers between the atrium and residential unit facades, and active noise management systems that monitor sound levels and activate mitigation measures when thresholds are exceeded. The residential units themselves would require acoustic isolation from the atrium environment — high-performance glazing systems, sealed facades, and structural decoupling that prevents vibration transmission from the building’s structural frame to the residential interior.

The holographic dome adds an additional acoustic dimension. The projection systems generate their own sound environment — soundscapes that accompany the visual projections, creating immersive audio-visual experiences. Managing the boundary between the dome’s programmed sound environment and the quiet required in residential units demands careful acoustic zoning that separates entertainment zones from living zones both spatially and through building physics.

For the structural engineering supporting these interior spaces, see our engineering analysis. For the smart building technology animating the interior, see our technology section. For the sustainability credentials of the interior design, see our green building analysis.