chihiro konno + kenjo ohashi: bamboo heat pad pencil

the heating pad contains bamboo shavings by means of the user sharpening his/her pencil. when the bamboo chips are
 enclosed within the satchel, they begin to ferment and the remains produce an average temperature of 50 degrees celsius
 for a duration of 2-3 years. after the period of heat has ended, the matter held within the heating pad
 may then be used as plant fertilizer, in its composted form.