Interactive graphs are very useful in interpreting different size and portions of different subdivisions, enabling users to explore the data themselves.
To take an example, figure 1 is Google’s work of displaying a variety of music genres waxing and waning in popularity for the recent 5 years. Based on the user data collected from Google Play Music about the number and genres in their library. The covered genres include from folks and country to R&B and rock. Every genre was presented by a stripe. What interesting is that user can click on the stripe so that we will be able to have a deeper insight of the single genre.
The combination of data and timeline is worth noticing. similarly, Twitter’s engineers are good at this. The graph depicts the hottest keywords on twitter of President Obama’s 2014 State of the Union. Very powerful.
reference: http://blog.udacity.com/2015/01/15-data-visualizations-will-blow-mind.html