Japanese studio NI&Co. Architects has built a small sound-proofed cabin in Nagoya where its owners can retreat to play the piano.

Nestled amongst a number of taller buildings in a residential area of the city, Piano House was designed by NI&Co. Architects as a simple structure with a purple brickwork exterior and a timber-lined interior.

An asymmetric roof angles up into a point above the entrance, creating enough height for a sheltered door with a window above.

This leads through to a corridor, created by a partition wall that gradually angles further away from the ceiling. This wall folds halfway along, leading through to a space accommodating both a grand piano and an upright piano.

"The spiral shape wall is extended to the inside, so you can feel the continuity of internal and external space," said architect and studio co-founder Nina Funahashi.

The partition is punctured by a large rectangular opening that suggests an informal spectator spot.

As well as basic plywood panels, the interior walls feature several patches of pegboard that help to improve the internal acoustics of the space.

"We designed an acoustic layer and sound insulation layer by combining the general-purpose materials, so the soundproof chamber can have acoustic and echo function with a low budget," said the architect.

A cluster of globe-shaped pendant lamps hang from the ceiling, diffusing light through translucent surfaces.

Photography is by Hiroshi Tanigawa.

Here's a short description from NI&Co. Architects:

Piano House K.448

This house with a spiral shape plan is for playing the piano. The site is 7m width and 15m depth, and surrounding area is a quiet residential quarter. The blanks are created by rotating the house 10 degrees against the site, and it brought the soundproof effect as a buffer zone for surrounding area.

The spiral shape wall is extended to the inside, so you can feel the continuity of internal and external space by the wall. We designed an acoustic layer and sound insulation layer by combining the general-purpose materials, so the soundproof chamber can have acoustic and echo function with a low budget.

A sound wave can reach ears through air encircled with the spiral shape wall. The spiral shape wall extending to the inside is customisable for adjusting convey of piano's sound, so the wall can bring about changes in the sound environment. It becomes the space for 'sonata for two pianos'.