What a pilot sees outside the cockpit informs a lot of what they do inside the cockpit. Unfortunately, that view can also be deceptive.

Linear Perspective Illusions can occur over sloping terrain, or where a runway is wider or narrower than a pilot is used to.

From a greater height, a wide runway may appear to be the same width as a narrow runway. For that reason, a pilot used to narrower runways could believe that their height on approach is lower than it really is.