City of Aarau

After the remodeling of Aarau Central station and the surrounding public spaces, the pedestrian tunnel was named in honor of Albert Einstein in commemoration of his formative years spent in the Swiss town.

This set the theme for the visual content: scenes which play with physical principles, illustrating laws of time, energy, and gravity; the forces of nature in response to moving bodies and the passing of time.

The playback engine that we developed interweaves generative, always-changing visual algorithms blending in a large number of pre-rendered video loops by Rolf Derrer and Eduardo Santana.

The installation reacts to pedestrian movements via an array of retina sensors embedded into the ceiling of the underpass.

These programmable high-performance sensors record movement vectors of any number of objects and communicate directly with our rendering engine.

The sensors were developed by Tobi Delbruck and were customized for this project by Christian Braendli at the Institute of Neuroinformatics of the University and ETH Zurich.