A spiral staircase and a glass-floored mezzanine gallery form the centrepiece of Picardi Architects' alterations to a third-floor attic flat in London's Holland Park. The staircase and gallery are slotted within the volume of the pitched roof. Their components - glass, steel and acrylic - were chosen to create a structure that would transmit light from a new overhead rooflight, creating a feeling of spaciousness in the refurbished interior.
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