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Your brain is a pattern recognition machine that takes sensory input and constructs a model of reality. When that model is incorrect, reality may behave in ways you don't expect. This experience is called surprise. If your brain works right, surprise will prompt an update of your reality model.

Your reality model may have predicted that this page would contain certain content that it doesn't actually contain. Instead it's just a 404 page.

I advise you to update your reality model to incorporate this new information.