I love histogram sliders! I think they were originally developed by Chris Ahlberg in Ben Shneiderman's group, and were later commercialized in Spotfire (I have yet to see them in any other infoviz system except Panopticon - https://www.perceptualedge.com/blog/?p=965). Jeff Heer did some work a few decades to generalize into 'scented widget' (http://vis.stanford.edu/papers/scented-widgets). With systems like DuckDB it's now even easier to implement them into various visual analytic systems.
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