shiffman/The-Nature-of-Code — pull request #352 by alignedleft (2014-01-04 20:37:33+00:00)
Title: Changed "brightest" to "darkest", to sync with Example I.4

The circles used in this example are black (with transparency), so as they accumulate near the mean (the center point), they become dark.

Yet the text here refers to the "lightest" point. I think it should be "darkest".