Twitter's headquarters in a 1937 San Francisco building features brightly coloured furniture, padded booths, games rooms and an enormous roof terrace (+ slideshow). More about Twitter's headquarters in an Art Deco tower by IA Architects and Lundberg Design
This week's job of the week on Dezeen Jobs is a position for a design engineer with London studio Troika, whose Arcades installation featuring beams of light that appear to bend into curved gothic arches is pictured. Visit the ad for full details or browse other architecture and design opportunities on Dezeen Jobs.
More about Job of the week: design engineer at Troika
Steel reinforcing bars are used for shelving and partitions at this coffee shop in Dublin by VAV architects. More about Reinforcing steel creates shelves and partitions in Dublin coffee shop
News: Rem Koolhaas' OMA has won the competition to design a new bridge across the river Garonne in Bordeaux with plans for a 44-metre-wide structure that will accommodate traffic and pedestrians, but could also be used for hosting events. More about OMA wins Bordeaux bridge competition
American firm Johnston Marklee has designed a circular house with a paddling pool on the roof as part of a series of inventive holiday homes proposed by architects including Sou Fujimoto and Didier Faustino for a national park in Spain (+ slideshow). More about Johnston Marklee designs rotunda residence for series of Spanish holiday homes
This clothes hanger by Irish studio Gazel can slide out of the top of a shirt without stretching the neck thanks to its offset handle (+ slideshow). More about Z-shaped clothes hanger easily fits through the neck hole
T is for Japanese architect Toyo Ito, whose Tama Art University Library is behind today's advent calendar window. Completed in 2007, the library comprises slender concrete arches that span lengths of up to 16 metres. Ito was also this year's Pritzker Prize laureate and his other projects include the Za Koenji Public Theatre in Tokyo.
See more architecture by Toyo Ito »
More about Dezeen's A-Zdvent calendar: Toyo Ito
These necklaces by Canadian studio Ahora Silhouettes display the molecular structures of drugs, allowing the wearer to accessorise with the illicit substance of their choice (+ slideshow). More about Wear a representation of your favourite narcotic around your neck
Hungarian art and design collective Szövetség'39 has unveiled a concept to reduce the impact of rising sea levels in the world's delta regions by introducing a modular structure that will cultivate mangrove forests to form natural dams. More about Modular CALTROPe structure reduces impact of rising sea levels by cultivating mangrove forests
Our last Dezeen Mail this year leads with the recently opened Stonehenge Visitor Centre and also features the latest news, jobs and reader comments from Dezeen.
Read Dezeen Mail issue 183 | Subscribe to Dezeen Mail
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A concrete kitchen worktop doubles up as a dining room floor inside this renovated house in Porto by Portuguese studio Ezzo (+ movie). More about House in Porto features concrete floors that double as kitchen worktops
The latest version of this app by creative collective The Morpholio Project enables images in a digital portfolio to be annotated and drawn on, as if sketching on a sheet of tracing paper laid over the top. More about Digital portfolio app features layers that behave like tracing paper
A house modelled on the form of an explosion by Portuguese artist and architect Didier Faustino looks set to become the next completed residence in the series of Spanish dream houses for French developer Christian Bourdais. More about Didier Faustino's Big Bang-inspired structure to be next in series of dream houses
Stars made from bent glass tubes like neon signs by designer Pernilla Ohrstedt illuminate the Christmas tree at the Edition hotel in London. More about Glowing stars by Pernilla Ohrstedt decorate Christmas tree in London hotel
Sou Fujimoto is the nineteenth architect to feature on our festive calendar. The Japanese architect, who claims to design structures "in between" architecture and nature, designed a cloud-like structure for this year's Serpentine Gallery Pavilion and previously completed a tiny wooden house built from a stack of chunky timber beams (pictured).
See more architecture by Sou Fujimoto »
More about Dezeen's A-Zdvent calendar: Sou Fujimoto
Japanese architect Sou Fujimoto has designed a house encased in a lattice of giant sticks as part of a series of dream houses proposed for Spain's Matarraña region (+ slideshow). More about Sou Fujimoto's Geometric Forest to feature in series of Spanish dream houses
Italian design brand Arper is to relaunch a limited edition version of a bowl-shaped chair designed by late Modernist architect Lina Bo Bardi in 1951 (+ slideshow). More about Arper to relaunch Lina Bo Bardi's Bowl Chair
A rock garden filled with trees and shrubs is sandwiched between glazed rooms and floating windowless walls at this house in Japan by mA-style Architects (+ slideshow). More about Green Edge House by mA-style Architects has a hidden garden around its perimeter
Japanese studio Nendo has redesigned the humble chopstick, creating six new versions including one with a profile that looks like a flower (+ slideshow). More about Nendo works with traditional manufacturer to redesign chopsticks
News: 3D-printed eye cells could "aid in the cure of blindness" according to researchers at The University of Cambridge, who have successfully printed adult nerve cells for the first time. More about 3D-printed eye cells could "cure blindness"