Through a green, arched opening, the bath looks almost like a room inside a room. Its white interior is edged in dark-green tiles; timber lines one side, and the same tall curve continues overhead. It is a surprisingly enclosed-looking place to put at the centre of a flat.

The central soaking bath. Photography: Adelina Iliev. Design: Inter Urban Studios.

That position is the defining decision in Inter Urban Studios' renovation at Imperial Hall, near Old Street in London. In Fleur Britten's Livingetc interview, architect Micah Sarut describes three internal windows from the bathroom towards the living room, dining area and bedroom. The bathroom's three sightlines make it part of the flat's shared space.

The building is Grade II-listed. The practice's project account on RIBA's directory describes an earlier, poorly converted flat, with original brick and steel revealed during the renovation. Japanese bathing and a tatami relaxation room became part of the new arrangement.

The green enclosure gives the bath a clear edge. There is enough depth around the opening for the tiled lining to be visible, so the frame feels substantial. It offers a view into another small setting, rather than leaving the white tub as an isolated object in a larger space.

A separate WC sits beyond another pill-shaped green door. In the photograph, dark tiles and a raised threshold give the small space a clear boundary. Exposed brick and bright artwork remain outside.

The pill-shaped green door opens onto the separate WC. Photography: Adelina Iliev. Design: Inter Urban Studios.

Livingetc links the door's inspiration to the Anywhere Door in the Japanese anime series Doraemon. Against the rough brick wall, its smooth green curve gives even this small opening a definite character.

From the living area, the repeated green curves sit against exposed brickwork and dark overhead steel. A suspended chair hangs in front of one opening; a low, rounded sofa occupies the foreground. Those soft forms make a pleasing contrast with the straight lines of the older structure.

The bath belongs to a wider sequence of framed internal views. Photography: Adelina Iliev. Design: Inter Urban Studios.

The furniture can change position, too. Livingetc reports a modular sofa and a dining table made from four triangular sections. That flexibility matters in a room where the openings have already established several possible directions to look. Seating can respond to the layout without requiring every activity to face one fixed point.

The exposed structure keeps the curved green joinery from becoming the room's only subject. Brick, steel, tiled surfaces and upholstered furniture remain distinctly themselves. There is pleasure in that difference: an opening can be carefully finished while the wall around it retains its roughness.

A centrally placed bath is a highly personal choice. Moving a bathroom in another home needs professional consideration of structure, drainage, ventilation, electrics and any listed-building consent.

What interests us for a more ordinary flat is the attention paid to an internal view. A carefully positioned opening could bring a neighbouring room into the outlook, provided privacy and the building's practical requirements are resolved. There need not be an extraordinary object on the other side.

Here there is, of course. But the bath photograph's appeal comes from the depth around it: green frame, darker tile, timber and the pale tub beyond. Even before anyone uses the room, the space between those layers gives you something to look into.