A stacked-series Horizon chart showing the USD exchange rate of currencies over time.
Blue represents a rate that is higher than the latest, and red a lower one.
Using a higher number of horizon division bands (12 in this example) reveals a heatmap-like view, specially with the small vertical space available to each series.
Built using the reusable component horizon-timeseries-chart.
Data sourced from https://www.bis.org/statistics/xrusd.htm.