The GitHub contribution graph
A year as a grid of weeks by weekdays, in four colour steps. Precision is traded for pattern: you cannot read a count, but streaks, holidays and burnout are obvious.
No preview is available from the publisher, so this is a diagram of the chart type, not the artifact itself.
By
GitHub
Where
Cloud & DevOps · Software work
Form
Interactive · to inform
Visual
Colour, Density, Sequence
You can
Hover a day, Switch year
Original