The spectrum analyzer is used to do distortion analysis to the signal. Due to the fact that we don't have a pure generated signal. In reality, there must be some distortion. The distortion analysis is important in the communication field as well as in electronics.

It is the ionosphere.

Globes usually depict reality. Maps usually have some distortion to them.

Yes. Hallucinogens change the way your brain interprets time, reality, & the environment around you. They also affect the way you move, react to situations, think, hear, & see.

possible hallucinations loss of sense of reality distortion of perception