Ukiyo Sanctuary Pavilion
Shadow, charred sugi wood, and tactile Japanese materiality illuminated as living poetry
Architectural Framework
Nested in the forested foothills of Arashiyama, the Ukiyo Sanctuary Pavilion is a private contemplative retreat constructed from traditional cypress framing, Shou Sugi Ban (charred cedar), and hand-troweled earthen juraku walls. In classic Japanese architectural tradition (In Praise of Shadows), darkness is not an absence of light, but an active architectural material that must be carefully sculpted.
Recessed ceiling cans were forbidden by the architect to preserve the integrity of unblemished exposed cedar timber ceilings. Furthermore, modern LED fixtures typically blast surfaces with flat, sterile flood illumination, flattening the three-dimensional charred texture of the wood and washing out the delicate warmth of cedar resin.
Ultra-narrow elliptical grazing distribution kissing the textured timber plane at an 8° incidence.
The Concept of Luminous Absence
LPA devised a scheme focused entirely on low-level tangential grazing and concealed perimeter reveals. Luminaires were hidden in knife-edge floor plinths and perimeter timber slots, casting micro-tangential beams (5° to 10°) upwards and downwards along the surfaces. Color temperature transitions dynamically from 2400K down to a candle-like 1800K as natural dusk descends over the Kyoto valley.
Utilized CONVEX C-25 micro-extruded cove profiles hidden inside the floating ceiling shadowline, casting a 120° batwing indirect wash across tatami mats with zero visible glare. Along the exterior timber corridor, miniature CYLINDRO X-40 solid aluminum cylinders with internal honeycomb snoots were surface-pinned to historic cross-beams, projecting a 12° knife-edge spot to highlight Japanese calligraphic scrolls without spilling onto surrounding plaster.
The residence achieved an intimate average illuminance of 85 lux in living spaces with UGR < 4.6. The deep fissures and iridescent charcoal sheen of the Yakisugi wood are accentuated with tactile, sculptural intensity, evoking timeless serenity.
Spatial Documentation
Photographs demonstrating vertical boundary illumination, texture relief, and source concealment.
The Engawa corridor: charred Yakisugi cedar grazed tangentially at 2400K with deep shadow relief.
Tea ceremony alcove: CONVEX C-25 concealed datum separating ceiling gypsum from timber posts.
Bath pavilion stone immersion: CYLINDRO X-40 surface spotlights highlighting rough cleft granite.
Warm-Dimming Optical Calibration on Natural Materials
All fixtures utilize custom phosphor blends calibrated along the Planckian locus with R9 > 96 and ultra-low flicker index (< 0.005) down to 0.1% dimming. This ensures tatami reeds and aged cedar retain saturated organic tonality without shifting into sickly yellow hues.
Low-Level Engawa Horizon & Shadow-Cast Envelope
Detailed CAD sections and ray-tracing diagrams available in the Phaos Specification portal.
Instruments Deployed in this Project
Click any instrument to view its comprehensive digital monograph, 3D BIM, and IES files.
CONVEX C-25
Role: Perimeter indirect float separating cedar ceiling from plastered wall planes.
CYLINDRO X-40
Role: Surgical spot lighting for Japanese scroll alcoves and rough-hewn stone basins.
APERTURE M-60
Role: Low-glare task illumination in chef kitchen and wellness washrooms.
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