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On a site with a vertical scrolling layout where images are displayed one below the other, and clicking an image opens a Modal box to display it in a bigger view, navigation to the next and previous images should be left/right or up/down?
In my experience it is common that pages use the left/right solution.
Why is left/right solution widely used rather than up/down which would respond to the actual display of the images in the page layout?
The modal doesn't need to mimic the layout of the underlying page. Because it's more natural for people to read left-to-right in the western world. The pattern follows horizontal motion reading patterns.
