TL;DR The way you experience reality and life inside your head differs more than you would think from the way the next person experiences it. At the bottom of this page is a list of deep introspective writing curated to uncover just such differences. Even if you sense that a certain inner experience of yours—say, the way the color red contrasts with green—is different from other people, if no one around you ever mentions the possibility of such difference, your social instincts will nudge you to assume that it doesn't really exist.