This pen is designed to map and visualise the invisible radio fields around RFID tags. The pen only draws when it detects the an RFID signal from a reader below the paper.

RFID fields turn out to be perfectly circular...

It was made in 2006 by Schulze & Webb and Timo Arnall. This version is modified by Einar Sneve Martinussen.

j vimeo.com/862224

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