Here's the link for his post:
But here's also the post itself. Enjoy:
My friend Eddie reminded me of this nice set of figures that made the rounds a few months ago on Visual.ly (and also Reddit).
I thought it would be cool to zoom in on the USA in high detail using data from the 2010 US Census... so that's what I did. As a bonus, the pixels represent the density of ZIP codes in small bins, which essentially track population density. Enjoy!