Nobody reads a page from top to bottom.
They scan. They jump. They look for the thing that matches what they came for- and they leave if they don't find it fast enough.
This isn't laziness. It's how attention actually works.
Neisser's research on visual search showed that the brain doesn't process a visual scene sequentially. It runs parallel searches, constantly scanning for features that stand out against their surroundings. Color. Contrast. Movement. Familiar shapes. The eye is drawn to difference, not content.
Norman connected this directly to interface design through the principle of visibility: the right information needs to be in the right place, at the right visual weight, at the right moment. Not buried. Not competing. Present.
Here's what this means in practice:
If everything on your page has equal visual weight, nothing gets found.
If your most important element doesn't stand out from its surroundings, the scan misses it.
If you're relying on users reading carefully to understand your product: you've already lost most of them.
Hierarchy isn't a design preference.
It's a map for the scanning brain.
The page you design and the page your user experiences are two different things.
One is carefully constructed.
The other takes about 200 milliseconds to judge.
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