Originally called "two-tone pseudo-coloring", a horizon graph increases the density of time series graphs by dividing and layering filled line charts.

Intro:

• We review Sizing the Horizon: The Effects of Chart Size and Layering on the Grahpical Perception of Time Series Visualizations.

• We will use this example to illustrate these definitions:

  1. Mirror
  2. Offset
  3. Band

Outline:

• Problem: creating an effective presentation of multiple time series.
• Goal: display more charts in a fixed area.
• Reason: viewers need to quickly and reliably spot trends.

Initial thoughts?

• Stock example.