Origami: U4-30 floral ball

U30

U4-30, designed by Kazutaka Naka

I folded this from someone else’s origami book, which was in Japanese.  I don’t know why it’s called U4-30, although I know the “30” comes from the 30 sheets of paper it’s made from.  Perhaps this is the sort of technical name you come up with when you’ve designed lots and lots of variants.  Yes, it was an entire book of roses and floral balls (Origami Rose & Kusudama).  It’s very nice, so I think it deserves an entire book of variants.

It’s a curler unit, meaning the units are attached by twisting them together.  I used three slightly different shades of red, which gives it a subtle texture without creating contrast between the different units.

Origami: Sferica

Sferica

Sferica, designed by Riccardo Colletto

I’m out travelling, but I brought some origami paper to fold.  I got this model from the 5th Geometric Origami Convention, and folded it on the train.  It’s essentially a variant of the herringbone tessellation, but slightly shifted so that it makes a shape like a sea urchin.

Origami: Polyrhythmic flower

Polyrhythmic flower

Polyrhythmic flower, designed by me

This is a pleat-based design, similar to other designs I’ve posted before.  They’re fairly simple to fold on the spot and improvise.  This probably took me like 20 minutes to fold, but I like the idea.

So what’s the idea behind this one?  I fold the paper into 16 divisions… and also 15 divisions.  So the outermost pleat is 1/16 – 1/15 = 1/240.  The next pleat is 2/16 – 2/15 = 2/240, and so on.  So the pleats are very small towards the edge of the paper, and very large towards the center.  Ever since I demonstrated this idea to myself, I’ve been wondering how I can apply it to make more complex designs.

How do I fold 15 divisions, you ask?  I have some diagrams here, but I’ve been thinking for a while I ought to make some clearer diagrams.