Creature House Expression was an award-winning vector graphics editor developed by Creature House in Hong Kong, founded by Alex S.C. Hsu and Irene H. H. Lee.

In Sep 2003, Microsoft acquired the software product together with all related trademarks and titles and hired Dr. Alex S. C. Hsu as an architect.

Eventually, Alex S. C. Hsu led a new Microsoft team to continue the development of the software under the code name Acrylic[5] as part of a new Expression Suite Project initiated by Alex S. C. Hsu and others.

Windows XP and Vista versions are available, although Mac OS X support was officially discontinued.

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.