Doors, Interior, and Metal When the sliding doors are left open, the rooms enter into a playful dialogue with each other, with the dark exterior walls framing the more colorful bedroom within.  Photo 6 of 7 in 7 Minimalist Apartments Around The World from Minimal Apartment in Lisbon Divvied Up by Sliding Doors

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José Andrade Rocha brought a 592-square-foot apartment in Lisbon back to life by restoring its original, early 20th-century materials, strengthening its relationship with the street, and defining its public and private spaces. A series of gray sliding doors divide the living spaces.