The Fitful Flog

October 28, 2007

Curvaceous Cube!

Persimmon Boxes

These are Persimmon Boxes, so named because of a paper by Naoko Takeda which discusses, among other things, self-locking kaki folds. Kaki, you see, is Japanese for persimmon. A good read, that. I’ve been experimenting with these kaki folds this week and decided I had been using them for a while now, but it’s good to have a name to hang on them.

This model is fun — it’s sturdy and has an interesting interior space. You hold it up to the light and it suggests a hyperbolic cube, but this is a chimera. I mean, it’s developable and all. The long axes on the sides are straight lines — these lines suggest a tensegrity icosa, but that’s best ignored for the time being. What’s really going on here is the intersection of three hyperbolic cylinders.

This would make a good container. One of these days, I’m going to buy me some of that white food-grade paperboard and go to town. You build a better Chinese take-out container and the world will beat a path to your door. But the world will have forgotten the hot mustard and will still want a tip, even though the fried dumplings will be all sweaty and stone-cold. This is where you will tell the world to get off.

Persimmon Box Crease Pattern

3 Responses to “Curvaceous Cube!”

  1. 1
    Jane Says:

    We call it kaki too, but it’s written caqui. (I think it sounds the same, tonic syllable is the last one)

  2. 2
    margaret Says:

    Dear Mr. Chapman-Bell
    I really enjoy your website with the CPs and the mathematical links – like this last one (the curvaceous cube).

  3. 3
    Naoko Takeda Says:

    Dear Mr. Champman-Bell

    My name is Naoko Takeda, who create the selflocking-kaki.
    If it is possible I would like to contact you by e-mail.
    thank you in advance.
    naoko t.

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