Expression uses a unique technology called skeletal stroke. There have been a few research papers on this technology, including the work of Alex S. C. Hsu and Irene H. H. Lee,6 who are the original developers of Expression.
Along with Expression, Create House also developed animation software called LivingCels, featuring the same technology, including skeletal strokes, as in Expression.7 LivingCels was released as a public preview,8 but never made it to final release after Creature House was purchased by Microsoft.
"About Creature House". Archived from the original on 2013-02-16. https://archive.today/20130216094331/http://www.livingcels.com/company.html ↩
Susan Glinert Stevens (August 27, 2001). "Expression 2: Natural Media the Vector Way". http://www.creativepro.com/article/expression-2-natural-media-the-vector-way ↩
David Nagel (October 19, 2001). "Creature House Expression 2". http://www.digitalproducer.com/article/Creature-House-Expression-2-5687 ↩
David Nagel (April 17, 2002). "Creature House Expression 2.4.1". http://www.creativemac.com/2002/04_apr/reviews/expression241cm.htm ↩
"Microsoft "Acrylic" Beta". https://www.pcmag.com/article2/0,2817,1833044,00.asp ↩
Siu Chi Hsu; Irene H. H. Lee (1994). Drawing and animation using skeletal strokes. New York, NY, USA: ACM. doi:10.1145/192161.192186. ISBN 0-89791-667-0. S2CID 17961553. 0-89791-667-0 ↩
"About Creature House". LivingCels. Archived from the original on 20 June 2008. Retrieved 20 June 2008. https://web.archive.org/web/20080620010851/http://www.livingcels.com/about.html ↩
Neowin Staff. "Microsoft's Creature House Acquisition". Neowin. Retrieved 21 October 2018. https://www.neowin.net/news/microsofts-creature-house-acquisition ↩