Technology leaders and researchers are slowly starting to understand the 404 phenomenon and it's behavior. These tech-heads, after many round table discussions and laboratory sciency stuff, have finally figured it out. You can read their full research reports here and here. Okay, so those articles are lengthly and riddled with language that far supersedes lamen terms so, let me break it down for you.
The page you are looking for is, in fact, here. It is not here once you observe the page. Observing the page creates a 404 response and is no longer here.
So, what do I do now? The best solution, according to this article, is to not observe this page. Scientists have proven that a 404 will never be visible if it's not observed.
Phew, glad that's cleared up. Happy surfing!?