  Visual augmentations are commonly added to charts and graphs in order to
convey richer and more nuanced information about relationships in the data.
However, many design spaces proposed for categorizing augmentations were
defined in a top-down manner, based on expert heuristics or from surveys of
published visualizations. Less well understood are user preferences and
intuitions when designing augmentations. In this paper, we address the gap by
conducting a design elicitation study, where study participants were asked to
draw the different ways they would visually express the meaning of ten
different prompts. We obtained 364 drawings from the study, and identified the
emergent categories of augmentations used by participants. The contributions of
this paper are: (i) a user-defined design space of visualization augmentations,
(ii) a repository of hand drawn augmentations made by study participants, and
(iii) a discussion of insights into participant considerations, and connections
between our study and existing design guidelines.
