Wiktionary
flip sides
n. (flip side English)
Usage examples of "flip sides".
Narcissism and paranoia are flip sides of the same distorted sense of self-importance.
The Ego and the Eco as flip sides of the same flat and faded coin, both oriented toward the same great interlocking order, however much their responses to it indeed varied (the Ego trying to get out of it, the Eco trying to get into it).