The instruments at Blackrock Castle used for the project search for hydrogen in the universe. Their sensor is calibrated on 1.4 GHz, which resembles the frequency of hydrogen. While scanning the sky, the amplitude of the incoming frequency of 1.4 GHz represents the amount of hydrogen at the particular position.
Hydrogen consists of a single positive core and is surrounded by one single electron. Furthermore, it has a crystal structure. All these facts will be integrated in the graphical and audio representation of the incoming data.
The book "Information Arts: Intersections of Art, Science, and Technology" [http://www.amazon.com/Information-Arts-Intersections-Science-Technology/dp/026223209X] was fairly helpful in getting started with the first visualizations in Processing.
There are two different position in the installation's space, where this incoming data has to be shown: On the interactive poster and on the floor projection itself, which will possibly be projected onto the star field projection. Here are some first interactive processing sketches:
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