Upside-Down

When you first see glass and mirrors you only see that it's translucent and void of any color and shade, but upon closer inspection you see that it reflects everything. Still that isn't all, for in the light it reveals its hidden colors like prisms, even so there is more to be said than just that. In many kinds of lore it is believed that the reflection of yourself in glass is your dark version of yourself and a doppelgänger who will try to pull you in to switch places with you in the real world, but what if it's just you?