  Visual embellishments, as a form of non-linguistic rhetorical figures, are
used to help convey abstract concepts or attract readers' attention. Creating
data visualizations with appropriate and visually pleasing embellishments is
challenging since this process largely depends on the experience and the
aesthetic taste of designers. To help facilitate designers in the ideation and
creation process, we propose a design space, VizBelle, based on the analysis of
361 classified visualizations from online sources. VizBelle consists of four
dimensions, namely, communication goal to fit user intention, object to select
the target area, strategy and technique to offer potential approaches. We
further provide a website to present detailed explanations and examples of
various techniques. We conducted a within-subject study with 20 professional
and amateur design enthusiasts to evaluate the effectiveness of our design
space. Results show that our design space is illuminating and useful for
designers to create data visualizations with embellishments.
