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Architecture CitySail


 Installation CitySail

Architecture CitySail

CitySails can be described as hybrid building-machines, blurring the boundaries between land-, water- and city scape. The CitySails combine an internal vertical garden structure, to generate a composite growing environment/recreational living area which is situated in the middle of the CBD.

The challenging constructive system of these wing type towers is flexible, turning with the wind and by this self stabilizing in windy conditions.  The face of the 100m high towers rapidly changes with the seasons of the year in correlation with the surrounding environment.

Inspired by the structure of the surrounding suburban areas, the CitySails are organized as a thin vertical layer of growing green. The functions of irrigation, living, and gardening are forming a hybrid system that is highly adaptive to seasonal and climatic changes.


XTH-berlin: Uwe Rieger and Scape: Duncan Lewis, Scape Bordeaux

Installation CitySail

The installation CitySail is both, a kinetic installation and a structural 1:25 test model. It is based on a tensegrity system, which is comparable to the structure of a dragon fly wing. This dynamic ultra light construction minimises the usage of material. It consists of identical pressure elements combined with 3 membranes, that are taking tensional forces. The inner CNC cut membrane defines position of the pressure rots and shapes the overall wing profile.

In order to simulate environmental responsive aspect of the CitySail project the installation combines the physical structure with digital projections. A 360-degree rotation is translates into seasonal changes over the course of a year.


arc/sec Lab: Uwe Rieger

with Fraser Horton and Alexander Wright


arc/sec Lab 

The University of Auckland

School of Architecture and Planning
26 Symonds Street, Auckland, New Zealand

Assoc. Prof. Uwe Rieger

Yinan Liu


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