  Example galleries are often used to teach, document, and advertise
visually-focused domain-specific languages and libraries, such as those
producing visualizations, diagrams, or webpages. Despite their ubiquity, there
is no consensus on the role of "example galleries", let alone what the best
practices might be for their creation or curation. To understand gallery
meaning and usage, we interviewed the creators (N=11) and users (N=9) of
prominent visualization-adjacent tools. From these interviews we synthesized
strategies and challenges for gallery curation and management (e.g. weighing
the costs/benefits of adding new examples and trade-offs in richness vs ease of
use), highlighted the differences between planned and actual gallery usage
(e.g. opportunistic reuse vs search-engine optimization), and reflected on
parts of the gallery design space not explored (e.g. highlighting the potential
of tool assistance). We found that galleries are multi-faceted structures whose
form and content are motivated to accommodate different usages--ranging from
marketing material to test suite to extended documentation. This work offers a
foundation for future support tools by characterizing gallery design and
management, as well as by highlighting challenges and opportunities in the
space (such as how more diverse galleries make reuse tasks simpler, but
complicate upkeep).
