both black and bright

'[Y]et even the tortoise, dark and melancholy as it is upon the back, still possesses a bright side; its calapee or breast-plate being sometimes of a faint yellowish or golden tinge. . . . The tortoise is both black and bright.'

'Herman Melville, from The Encantadas, a description of those islands also known as The Galapagos; 1854.