This visualization plots the dates of all executions performed in Texas since 1982.
The cells representing individual days are colored according to the executed prisoner's race.
This visualization is inspired by GitHub's contributions calendar and its code was adapted from Mike Bostock's D3 Calendar example. I performed minor layout post-processing in Adobe Illustrator.
Each year is represented by a grid of 365 squares, one per day.
Each grid column represents a week; from top to bottom, the rows correspond to Sunday through Saturday. The dark cell borders divide the year into twelve months.
To aid comparisons over time, the years are presented in groups of 10; reading vertically, we can examine year-by-year changes, and we can jump forward a decade at a time by reading horizontally.