Colors in November (3)

Is white a color?
And is this a question of a philosophical or a physical nature?

Anyway, I had (of course) a lot more rucola than we could possibly eat (and the kids like rucola as long as it comes from the supermarket packed in cellophane and not from the vegetable garden). So they start flowering. Little delicate four-leaved flowers.

Pretty.

This is #3 of my little subproject.
The others are
here and
here