Derealization is a form of dissociation where the person is distanced from their current reality. The dissociative person's point of view shifts to viewing things about the external world being fake, contrived, illusory, manipulated, vacuous, dystopian, etc. Often it includes other people as well as the environment.
So for example, thinking people are robots, or puppets. That the environment is an elaborate staged scene or movie set, like the walls are made of cardboard. Time sense can also be affected, so loss of time/place can occur such as riding the same elevator every day but not sure whether it's today or 20 days ago — or a moment of eerie uncertainty of whether it's about to open on the ground floor or the top floor.
Derealization can be a momentary flash and settle itself quickly, which is not dysfunctional or disturbing — such as deja vu (a sudden feeling like you've been here and/or done this before, when you know you have not). This is "normal derealization."
Derealization can also be persistent, disorienting, disturbing, uncomfortable, unrelenting, and affect functionality. It's extremely hard to experience trust and intimacy with your partner when you can't shake the sense that they're fake or programmed or having their strings pulled by some unseen power.
Derealization can also interfere with reality testing and presence.
Please feel free to comment some examples of how you have derealized.
when i walk out of the door of my apartment and nothing looks 'right' it feels as if im walking in some kind of dream-world. only it is vaugly familar , a place from my past coming back to say 'hi' its hard to really discribe it. sometimes this happens inside my apartment, a spooky kind of feeling that where i am and who i am don't exisit in the physical world. my surroundings take on a flat dull looking two-demensioal quailty.