[dv35z]

(1) Check out the underlying D3 example of zoomable circles - https://observablehq.com/@d3/zoomable-circle-packing?intent=...

(2) Explore D3.js interactive visualization demos -

https://observablehq.com/@d3/gallery

I show potential clients this demo page frequently, and it never ceases to blow minds and start interesting conversations!

Enjoy.