You're probably quite familiar with this map showing each US electoral county by who they voted for in November 2016.
However, this map posted on Reddit, gives a very interesting insight into just who voted for Trump and Clinton in high density population areas.
In light red are the counties with a population of less than 100,000 that voted Republican, in dark red countries that voted Republican with a population of over 100,000.
The light blue shows the counties with a population of less than 100,000 that voted Democrat, and in dark blue counties that voted Democrat with a population of over 100,000,
What do we see?
Lots of dark blue and light red, showing bigger counties overwhelmingly vote Democrat and smaller ones vote Republican.
The image is even more striking when you add in a third layer, showing counties with a population of more than 1,000,000.
It restates the extent to which the electoral college is skewed in favour of rural voting areas, and therefore Republicans.