Yvan Fornes says:

This approach can be useful when you need to visualise marks that are on top of each other.

It is a style similar to an area chart, but the data is divided up by calculated ranges within the data, rather than dimension members themselves.


A comprehensive tutorial is available on I think you need an account there to view it:

Blog posts

Nathan Yau explains the use case for this chart type:

Yvan Fornes wrote this detailed article, after being inspired by a viz from Joe Mako.

Example workbooks

Joe’s inspirational viz is available here:!/vizhome/UnemploymentHorizionChart-Gallery_4/HorizonChart

Screen Shot 2016-07-14 at 20.05.35