This week on Dezeen

We’ve reached the final week of the year and to get into the holiday spirit we’ve been publishing festive projects that include computer equipment and games consoles that sing Christmas carols and a series of geometric street lights in Berlin (pictured).

We also featured a Christmas tree made from 365 sledges and revealed Christmas cards sent by architects, designers and brands such as Zaha Hadid, MVRDV, Paul Cocksedge, Benjamin Hubert, Haptic Architects and Coop Himmelb(l)au.

In other news, researchers in Australia developed a pen that uses a process similar to 3D printing to “draw” regenerative stem cells onto damaged bone and cartilage. Meanwhile in Russia the designer of the AK-47 assault rifle Mikhail Kalashnikov passed away at the age of 94.

As protests continued against private shuttle buses for tech company workers in San Francisco, Dezeen columnist Mimi Zeiger discussed how designers and architects should engage with the fight, and we took a look inside the California offices of Twitter and Airbnb.

The most popular architecture stories of the week were a textured-concrete house that offers panoramic views of the dramatic Icelandic landscape and a renovated 1960s house in the UK with black-painted brickwork and an angular roof.

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• This week on Dezeen