2017) slide rule made at the age of 14, 2017. ,
, Abacus from Upper Italy (1340) German Historical Museum
, , 1950.
, , 2017.
, Picture from Collection Jak Boumans (2017) downloaded August27, 2013.
Supporting cooperative design through "living" artefacts, Proceedings of the 6th Nordic Conference on Human-Computer Interaction Extending Boundaries, NordiCHI '10, pp.541-550, 2010. ,
DOI : 10.1145/1868914.1868975