The browns and greens in this painting give it a nice woodsy feel.

[…] their parole or watchword, which is orange, distinguishes them from the rebels in any action, to prevent disagreeable mistakes.

2012-01, Robert L. Dorit, “Rereading Darwin”, in American Scientist, volume 100, number 1, page 23:

The future mother of his child was not going out and getting laid by some strange dick. He'd tie her to his bed before he let that happen.