> Ancient history: when I wrote BCPL roff, I immediately noticed the > page-level density gradient from thick on the left to thin on the > right if padding spaces were inserted from the right. I next tried > randomly distributing the padding. This was even worse because it > led one to perceive false phrase boundaries at the wider spaces. > The text became maddening to read. Only then did I try alternating > left- and right-padding, which has stood the test of time.
Here are some alternative strategies... https://xkcd.com/1676/
