The Origami Forum

I've been into Origami for 8 years or so, folded the ancient dragon. In short I consider myself experianced. But there are 2 diagrams I have come across on the internet I just can't finish. The first being the giant red sea urchin:
http://home.no.net/origami/urchin1.htm

The second is the Spring Into Action. I have accidently made one but now it just seems impossible. I can do the precreasing. but the "twist" is hard.

Has anyone here completed one of those two? Any other too dificult models?

Niels

I've done the Spring into Action. It's really boring to fold though. I never tried the red sea urchin. I saw the 145-spined purple one and made it instead. It's not hard at all.

For me it's Marc Kirschenbaum's one-piece Chessboard. I've never gotten a satisfactory one. I'm not sure it's possible.

oh yes you are right. ik tried that one too. not a succes either. the problem with the urchin is that i got the stumbest ( opposite of sharp?) points one had ever seen.

to me, this one looks like if you can do lang's, it's the same thing x 100.

btw, who is the author? nolan?

to me, the hardest origami prize still goes to lang's praying mantis in the first insect book. i've done it, but doing so without ripping the paper involving the antennae is quite trying.

http://home.no.net/origami/

That's the site of Hans Trygve Birkeland. Almost everything on there is his own design, except the chessboard (Kim Best) and 145-point Sea Urchin (Toshiyuki Meguro). The red sea urchin is pretty much the same as Robert Lang's 25-pointed one from Origami Sea Life. But smaller and with a lot more moves. Meguro's is nothing like that. It's really interesting and well done.


And Niels, the opposite of sharp is blunt or dull. What kind of paper were you using? Just take care on it. It's not too bad as long as you take your time and fold it accurately.

Spring into action is a very fun model (I have not done the urchin). I have folded several SIP's and I remember that the first ones were very hard, but once you "understand" how it works, is not that difficult


I found out by accident that you can do a simplified version with just half the horizontal creases. It is a lot simpler to collapse and it has less precreasing. The resulting model still has spring properties and you can learn from it and then work on the diffinitive one

Where can the instructions of that 145 point urchin be found? And the spring into action is fairly easy once you get the hang of the system

that's what is frustrating me so much, i have once made one, and the next day i just couldn't do it. when i try i can do the first 2 twists, and the third one is exactly the same, but i just doesn't work. ah well, got to try again some day.

i was using some kind of wrappig paper i thought was great. but it really wasn't. it's nice for some models, since it has a soft look.
next time i might fold all the little birdbases first before collapsing. it wil make it alot easier i think

I have found an instructional video from origami nut on the Spring In To Action.

here's the link: http://www.origaminut.com/2008/02/17/vi ... mi-spring/

I saw this video before but I still think it's pretty useless if you don't know what to do. that video is a miseable help for the spring in action.

i know that video, just like the urchin, i know how to do it and i understand it, i just can't. maybe my paper isn't stiffe enough to press it into shape like he does in the video.
i end up with something like the last picture on that page

Paper is important for SIA. Find a thin yet stiff paper and you should be fine.

spring into action and urchin are easy, the urchin is just a bit tedious to fold.i am stuck with the ryuzin 3.5 satoshi kamiya crease pattern that i got from a toronto meeting.

I think you're talking about ryuzin 2.1. The only cp for ryuzin 3.5 that exists is only a partial cp of the head.

Not true. As far as I know, the 3.5 CP was on display in Toronto, but I may be wrong. In fact, there are some members on this forum that has that CP. I'm not one of them, so dont ask me for it!