If you take a page of flat notebook and try to stand it up by laying it on its edge on a table it’s nigh impossible. But why does it support itself if you simply add a fold along the middle of the page?
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The same reason a table stands with 3 legs and not with 2. When it’s not folded all of it’s edge is along one axis and nothing is stopping it falling along the second axis. Once it’s folded it now has support at 3 points that are NOT in a line with one another, so it’s now supported on both axis.
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