https://xkcd.com/1939/

Kinda proportional symbol, kinda dot density...

Here is an example: https://www.r-graph-gallery.com/img/graph/294-basic-ridgeline-plot3.png

Hi Team, really appreiciate for your work!
Recently I am looking at your website and notice this strange issue:

there are two different kinds of chart types background on the website, most are white but some are grey.

See comment on Twitter: https://twitter.com/SurfSwan/status/925739467457155072

I really like your visual vocabulary. I think the typology is really nice.

I would suggest to add visualisation of uncertainty (or confidence intervals). One example would be coefplots which visualize the coefficients of a regression with confidence intervals.

The new link is - https://www.nationalgeographic.com/science/article/150922-data-points-visualization-eye-candy-efficiency