This is an example of the Gygax cartesian alignment chart being used to log the moral progress of PCs as vectors over time. After each session I'd make a new dot if I felt someone's alignment was shifted by in game acts, often connected by a line back through older ones. For a few characters like clerics & paladins, or bearers of aligned magic weaponry it mattered. With all the erasures, it's kind of hard to see.
It also records the deaths of all my high school friend's D&D adventurers that didn't make it back out of the dungeon or the wilderness. They'd get erased off the plot and marked below. Wish I had logged a bit more detail about how each one died, now that it is so long I don't remember for most.