[bflbfl]

@femto - that's a good point. That occurred to me, but for the moment I decided to stick with the red/green that was already used for the previous visualization. Well sort of, as I actually use d3.rgb.darker on the actual colors because I wasn't satisfied with the original ones, as they looked too light. Even for red/green, I think there's a lot of room for improvement here to make them stand out more.

I'm not sure off the top of my head what would be best for the rg replacement. Maybe some subtle shape differences, etc.

[phorese]

Some suggestions:

- "O" for birth, "X" (or "+"?) for death

- Filled circle for birth, non-filled circle for death

- Expanding filled circle for birth, Shrinking filled circle for death (might not work well with low fps)

If you decide to go with color change, here's some combinations that I (red/green blind) have trouble with:

- dark red/dark green/brown

- purple/violet/pink/grey

- dark red/dark purple/dark violet

- blue/violet/purple

- yellow/warm green/light brown

- yellow/orange