Dutch firm MVRDV has unveiled plans for an office block with an interactive mirrored facade in the city of Esslingen in southern Germany.

Dubbed the “crystal rock” by the Rotterdam architecture firm, the facade of the Milestone building will be formed from fritted glass containing photovoltaic cells that will reflect back images of the city and its surrounding landscape.

Extruded and indented blocks on the square grid of the facade will give the building a 3D profile that the architects describe as a “pixelated map”.

Passersby will be able to use their phones to interact with the facade, which will be printed with QR codes that reveal information about the city.

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