A combination of imagination and reality is a fantasy land of mind's perception to things. What if I do this? What if I choose this decision? What if I'm not me? What if there is no world?
A lot of random question pops up into our mind when we are dealing to unrealistic perceptives. Maybe we the exist into different world. Maybe they are design to view our past lifes. Maybe they are in our minds because we are the gods of our own perception. No person never imagine something. Sometimes, it is hard to think that the real world can be the fantasy. Your own fantasy dictates the way of life you are living. 90% thinks about the possible outcome of having a fantasy daydream world was better to the world they have. 10% of the people thinks that most of the things we think came up through negative emotions. Hatred, despair, vengeance, or either sadness.
The more we think of something, the more it may influence you.