This week on Dezeen

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This week a team of London-based designers unveiled a 3D-printing pen that allows users to create solid doodles in the air (pictured) and preservationists proposed a system to safeguard Mies van der Rohe's Farnsworth House from flood damage. Read on for more of the week's top architecture and design news, plus our Dezeen Music Project featured track.

Wednesday is a lush chill-out track by British producer and DJ Jo Noon.

Listen to more Dezeen Music Project tracks »

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Herzog & de Meuron's plan for Helvetia office extension

In architecture news, Herzog & de Meuron revealed designs for its fourth extension to the headquarters of insurance company Helvetia, while UNStudio unveiled plans to replace the facade of an existing Seoul skyscraper with one that controls the indoor climate during the day and transforms into a light show by night.

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The "world's first seamless glass structure" planned for Venice Biennale

Plans were revealed for the "world's first seamless glass structure", which will be showcased at the Venice Architecture Biennale by Japanese architect Kohki Hiranuma this summer. Meanwhile, France unveiled its pavilion for the World Expo 2015 in Milan – a latticed timber structure that will be used to grow edible plants for an in-house restaurant.

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Hans Hollein: a life in projects

Following the death of Pritzker Prize laureate Hans Hollein, Dezeen editor Anna Winston looked back at some of his best-known projects from a career spanning almost five decades.

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Drone Shadows by James Bridle

Designs of the Year 2014 coverage included Drone Shadows by James Bridle that evokes the "invisible" presence of unmanned military aircraftGerman auto brand Volkswagen's XL1, which it claims is the most fuel-efficient production car ever made, and a keyboard with soft keys that allow musicians to alter the pitch, volume and timbre of individual notes.

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PayPal's new mobile-friendly brand identity

In other design news, Yves Behar of San Francisco design studio fuseproject created a mobile-friendly brand identity for PayPal, while a motorbike reinterpreted as a piece of furniture was produced from a collaboration between Italian design studio Joe Velluto and motorcycle company NorthEastCustom.

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Calatrava's Liège-Guillemins Station captured in new photographs

The most popular story we published was a new series of images by British photographer Luke Hayes documenting Santiago Calatrava's train station in the Belgian city of Liège, which has now been in use for nearly five years.

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MAD's landscape-inspired Chaoyang Park Plaza

Other popular architecture stories included MAD's landscape-inspired Chaoyang Park Plaza – a complex of skyscrapers, office blocks and public spaces – and a Japanese house with no interior walls, meaning you can see what people are doing in other rooms, including the bathroom.

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Japanese house that offers little privacy to residents

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