Data Processing and Calibration in the Toki toolkit
I think this video explains it well enough!
For more details please consult the upcoming paper:
J. D. Hincapie-Ramos, M. Esbensen, and M. Kogutowska, “Rapid Prototyping of Tangibles with a Capacitive Mouse,” in The 11th Danish HCI Research Symposium – DHRS2011, November 2011. To Appear. – [pdf (6.6MB)]
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