>>531813you crease along the lines and guess. trial and error until you fold them the right way you can collapse it.
the better ones indicate whether its a peak or valley fold but many(most?) are just undifferentiated lines for some reason
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think of crease patterns as basically somebody folded it, unfolded it and photocopied the page.
its like the difference between tabs and sheet music, they both say how to play it and different people have an easier time reading/writing one or the other
