Hmm... functions of origami...Well, as with many artforms, there are certainly both manual and cognitive benefits to performing origami.Are you asking about the purpose of origami?
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The same purposes as any art form. To entertain yourself and others.
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It is a contemplative, and calming hobby, like knitting, or needlework. Most items you make are decorative/artistic. Some utilitarian folds are used for things like folding dinner napkins, and wrapping gifts. It's a good hobby for someone studying geometry, or interested in math.Mostly it's just fun.I made a lot of toys and figures when I was a kid, but now I'm into unit or polyhedron origami.