In The Illustrated Man, two stories that represent the theme of an optimistic vision of the future are "The Man" and "The Rocket."
In "The Man," the vision of the future is optimistic because, for one, the Earth has not been (or is not about to be destroyed). Technology has not destroyed humanity. Instead, evidence of Jesus has been found on other planets. Those who have encountered him (or who have found evidence of him) live in bliss and and are contented.
In "The Rocket," the vision of the future is optimistic because, as in "The Man," the Earth has not been (or is not about to be destroyed). Technology has not destroyed humanity. Instead, it is possible to go into outer space. When Bodoni cannot decide which of his family will go, he instead installs a virtual-reality theater so that his family can remain together and enjoy space virtually.
In both of these stories, technology is not presented as a destructive force. Humanity has not been destroyed. Therefore, these stories are optimistic.
