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an analogue, physical information sculpture that displays the daily average of CO2 concentration through a chemical reaction in which chalk particles are formed, which in turn changes the opacity of water encapsulated in plastic tubes. the "Statlab" installation samples air direct from a local area, so that the differences in water clarity creates an analogue graph in which the difference in the amount of chalk particles per tank is a global measure for the fluctuating CO2 concentration within one 1 week.

[link: bitlek.nl|thnkx Tjerk]

see also one trees electronic clones information environment.