Problem
Now that learned a bit about relational databases, let's take a look at data visualization again -- visualizations are fun and powerful and are worth a second look :). As before, find a visualization like (or don't like) - as before, this visualization might be from a social media feed, a book, a newspaper or other online source, or it might be a visualization made or have access to through your personal experience. Post:
a) A picture of or link to your chosen visualization.
b) An observation about what type of data processing and tools would be required to create that visualization.