The Ghost of Our Beliefs

Joshua is a retired engineer, but was not just an engineer by trade; he was one by heart. Ever since he was a child he has been fascinated by the mechanisms and machines that the human race has created to further enhance their lives. His mind is methodical, pragmatic and his beliefs stand firm in facts and reason. What is observable, testable and measurable is what exists and everything else is simply myth or theory.

His heart felt understanding of the world is disrupted and altered by the strange sighting of an unexplained figure or what is more commonly thought of as a ghost. Will this experience alter his beliefs or will the ghosts of his previous values stand firm?