The folding methods of the paper art envelopes we mentioned earlier seem to be a lonely confession or a personal greeting from a person, and they have never been envelopes that express co-operation or mutual respect. How can it be done? There will never be any loopholes left, so let’s learn how to fold this kind of envelope.
Triangular envelopes, I’ve never seen one before, give it a try~
Actually, as long as one side of the letter paper looks good, it can be folded like this~
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