  To facilitate engaging and nuanced conversations around data, we contribute a
touchless approach to interacting directly with visualization in remote
presentations. We combine dynamic charts overlaid on a presenter's webcam feed
with continuous bimanual hand tracking, demonstrating interactions that
highlight and manipulate chart elements appearing in the foreground. These
interactions are simultaneously functional and deictic, and some allow for the
addition of "rhetorical flourish", or expressive movement used when speaking
about quantities, categories, and time intervals. We evaluated our approach in
two studies with professionals who routinely deliver and attend presentations
about data. The first study considered the presenter perspective, where 12
participants delivered presentations to a remote audience using a presentation
environment incorporating our approach. The second study considered the
audience experience of 17 participants who attended presentations supported by
our environment. Finally, we reflect on observations from these studies and
discuss related implications for engaging remote audiences in conversations
about data.
