Emphasize more recent years by using a palette that increases in luminosity. Have a selected year (like current year) contrast against all others. Consider grays for background years.
Consider how to represent average depth (a third color? maybe not)
Emphasize more recent years by using a palette that increases in luminosity. Have a selected year (like current year) contrast against all others. Consider grays for background years.
Consider how to represent average depth (a third color? maybe not)