AB+AC Architects designed Casa Aether not as an apartment to be admired, but as a neurological instrument — a 100-square-meter sequence of atmospheres calibrated to regulate the body passing through them. Located in the Anjos neighborhood of Lisbon, the project opened during Lisbon Design Week 2026 as an immersive open house: not a finished image to photograph, but a spatial argument about what domestic architecture could be doing to the people who live inside it.
The premise AB+AC Architects bring to this interior renovation is precise and, in the context of contemporary residential design, quietly radical. Architecture, for the studio, is not a neutral container. It is an active emotional environment — one capable of shaping behavior, rhythm and perception. Casa Aether tests that claim room by room, treating proportion, tactility and chromatic intensity not as aesthetic choices but as instruments of physiological effect. The apartment is 115 square meters. The ambition is considerably larger.
In the living and kitchen spaces, handmade Moroccan and Portuguese tiled furniture establishes the first chromatic register: warmth cut by metallic precision. Natural light is treated as a building material in its own right, activating surfaces differently from morning to evening and turning the apartment into a continuously evolving condition. The custom fiberglass Moon lighting — designed by Arianna Bavuso, lead designer and co-founder of AB+AC Architects — introduces a softer diffusion tuned to the inhabitants’ circadian rhythm. Original ceiling moldings amplify verticality, pulling the eye upward and expanding the perceived scale of the room.
The bathroom is the project’s most explicit provocation. Saturated yellow tiles envelop the space entirely, inspired by the solar plexus chakra — associated in contemplative traditions with vitality, confidence and emotional energy. AB+AC Architects are direct about this: color here operates not decoratively but psychologically, transforming what is typically the most utilitarian room in the apartment into a space of activation and introspection. It is a bold claim to make in a tiled bathroom. It is also, spatially, entirely convincing.
The master bedroom proposes the inverse condition. Bespoke dark paneling wraps three sides of the room, framing a low platform clad in hand-painted tiles. Controlled light and soft reflections dissolve the scale of the space, producing what the architects describe as stillness and retreat. Where the bathroom accelerates, the bedroom decelerates. The choreography is deliberate: Casa Aether moves the body through a sequence of emotional states — activation, reflection, grounding — with the same intentionality a composer applies to dynamics. The apartment is 100 square meters, with an additional 15sqm patio.
The curatorial layer reinforces the spatial argument. Works by 3TWINS, Frederico Oliveira Vaz, Studio Lilium and Odara Studio are not installed as art objects within a finished interior — they are embedded within the perceptual rhythm of the apartment, emerging and receding into the architecture itself. The boundary between architecture, design and art is deliberately blurred, and the result is a space where the distinction feels not only irrelevant but slightly beside the point.
AB+AC Architects position Casa Aether explicitly as a prototype — a model for a more emotionally attuned way of inhabiting the city, not a luxury renovation. This framing matters. Anjos is one of Lisbon’s most culturally dense and rapidly transforming neighborhoods, opening the project during Design Week as an immersive open house invited the public to test the thesis with their own bodies rather than consume it as an image. The work of studios like atelier RUA, whose Casa em Galamares in Sintra organized an entire residence around the orchestration of light and void, suggests that Portuguese architecture is developing a sustained conversation about spatial perception as a design discipline — Casa Aether belongs firmly within it.
What distinguishes Casa Aether from the expanding field of “wellness interiors” is the refusal to aestheticize the concept. There is no spa vocabulary here, no biophilic cliché. What AB+AC Architects have built is closer to a controlled experiment: a domestic space that takes seriously the idea that architecture acts on the nervous system whether designers acknowledge it or not — and that the only honest response is to make that action conscious, precise and deliberate.