ABSTRACT
But is it true that there are even two types of fold? Indeed, the mountain fold can be turned into a valley fold merely by turning the paper over. So, instead of there being two types of fold, perhaps there is only one.
But is it true that there are even two types of fold? Indeed, the mountain fold can be turned into a valley fold merely by turning the paper over. So, instead of there being two types of fold, perhaps there is only one.