Appearance in Reality in Hoch's "Zoo"

What is the difference between a reality and an illusion? Sometimes people believe a distinctive difference between the two exists i.e. tangible or nontangible. However, the same people might agree that a difference does not exist when considering borderlines for example. The lines aren’t actually lines drawn into the ground; moreover, hypothetical lines drawn on a map. Not only can illusions become realities, but our perceived appearances and illusions have the ability to produce realities. Esteemed authors such as Friedrich Nietzschel agree illusions exist to understand reality. In Nietzschel’s books he stressed the idea that physiologically people want to believe in illusions and that they are key for differentiation between an illusion and a reality. “Sometimes people don't want to hear the truth because they don't want their illusions destroyed” – Friedrich Nietzsche.
Edward D. Hoch focuses on the concept of illusions creating realities in his short story Zoo. In Zoo, Professor Hugo flies unique alien-like creatures to different planets in his interplanetary spaceship zoo. When Hugo arrives on Earth with the zoo, the “peoples of Earth” file around the spaceship zoo each charged a dollar for admission to see “wild” creatures trapped in cages within the spaceship. When Professor Hugo returns the creatures to their home planet, the creatures tell their families how fantastic the trip was visiting the many worlds along with the different people. At this point it is understood the creatures take the role of the audience and not the attraction. Zoo’s content stems from illusions that could come right out of a science fiction movie or book. “Three-legged creatures from Venus. Or tall, thin men from Mars. Or snake-like horrors from some even more distant planet.” Before even looking into the meaning behind particular words and sentences within the story, the actually story creates a distinction between reality and illusion. The story references traveling to Venus