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Origami Construction System Challenge

PostPosted: March 30th, 2007, 2:08 pm
by firstfold
In a few weeks Tjips and Firstfold will begin folding one or models to demonstrate the characteristics of two different Origami Constuction systems. You might think of these two systems as "Origami Tinker Toys" that can be used to create a variety of models.

For the next few weeks I will be showing some prototypes of possible models.

Tjips and Firstfold have each proposed 5 models. Pleace choose from these models which you would most like us to complete. Add your comments also.

For the discussion that lead to this challenge see the "Sears Tower" in the Personal Website section of this foruim.

Edited by moderator to include all poll options

PostPosted: March 30th, 2007, 7:41 pm
by Daydreamer
firstfold, why didn't you include the suggestions made by others in this thread? There were some nice suggestions there, especially the doll house and the Sydney opera house.

If you wouldn't have wanted other people to suggest things, you should have talked about the list together with Tjips in private, not in public... it makes it seem you are ignoring everyone else...

PostPosted: March 30th, 2007, 10:02 pm
by firstfold
Thank you for pointing out that others have made suggestions. I had planned to point this out in another reply. The original challenge was made as a single item challenge by Tjips in the 7th reply to the thread. I made a counter proposal that we alternate ideas between the two of us until ten items were proposed. I most certainly do not want to ignore the suggestions of others. I wa simply trying to get things under way.

How might you suggest we handle those suggestions?

1. Inclusion in the same poll?
2. A separate poll?
3. As a write in?

I also have no problem trying to fold one model from the ten we proposed and one or more from the great wealth of suggestions made by others. . I do kinda want to insist that at least one of our proposal of ten items be included.
Anyone else is welcome to add thier models provided they represent an original model using an origami constuction method in a similar vein. I do plan to do the doll house at some time (with an elevator - if possible) I have seen the great website animation of the Sydney Opera house and to be honest my system for that type of structure would be boxy and lacking the true beauty of the structure, but still I could give it a go.

PostPosted: March 30th, 2007, 11:27 pm
by Cupcake
I'm up for seeing an impossible triangle folded out of paper, like I mentioned on the other topic

Conceptual Illusion

PostPosted: April 4th, 2007, 12:31 am
by firstfold
A conceptual Illusion

The illusion presented here was inspired by the suggestion of Cupcake. I will not duplicate the exact puzzle because I have a feeling that Cupcake may already have a good solution and is just waiting for a good time to reveal it. Instead, I present somehwat different illusion. Another advantage of this illusion is that it emphasizes some of the weaknesses and strengths of the "slip and Stick" methodology.
The parts used in the concept illusion look like the three parts shown below.
The parts used include sticks, elbows and slips. The number of parts used is shown in the table below.

Part Amount
Elbows 4
Sticks 4
Slips 8


Each of the pictures below shows the parts partially assembled. Each picture shows a different view of the same parts. One stick is inserted into one elbow and held in place with one slip and an additional slip is on the opposite end to aid in assembly.
These partially assembled parts are viewed from the top, bottom, outside and inside.


Imagine a small robot placed in the circle on one of the elbows: The robot can start on any circle. The robot must follow the green line. The robot can go forward but can not go backward and can not retrace any path once it is traveled.

The First Task:
Imagine a method to assemble the parts so that the robot will start and in the same circle no matter which circle is chosen.

The Second Task:

Determine the following: Which starting circle gives the shortest path. Which circle gives the longest path. How many different paths are there (one path can include more than one circles).

I will present one solution in about a week on my web site.

PostPosted: April 4th, 2007, 12:48 am
by firstfold
The imaginary robot must "Start" and "end" in the same circle!

I also am working on a much more complex illusion. It has hundred of parts and is both a visual and conceptual illusion. It will be a "Object of Art?" Don't expect a finished model for "Octical (made up word) Illusion" for another month or so!

PostPosted: April 4th, 2007, 1:13 am
by Cupcake
Oh, you wanted me to fold the impossible triangle? I'd have to use slip and stick, I think... I don't really know how I'd do it

PostPosted: April 9th, 2007, 5:45 pm
by firstfold
The obvious solution is to simply nest the parts of the puzzle into a rectangle. However, the illusion is that all elbows are the same. They are NOT! There is a seam that must be lined up to make the parts nest. The seam of each elbow faces in a different direction. The pink paper is inserted so that you can see the differences. Each elbow is folded with a different method. Visit the diagram section of my web site for the crease patterns for all four elbows.


One solution to the illusion is to twist the sticks so they can be nested. Theoretically there are now 4 green paths that are the same length because each path goes from inside to top to outside to bottom and back to inside. The practical results of this twist are less satisfactory creating very uneven paths! A better? solution will be presented soon. Visit the diagram section of my web site for the crease patterns for all four elbows.


PostPosted: April 9th, 2007, 10:14 pm
by firstfold
This one is NOT slip and stick. In fact, it is just one sheet over a pureland model for the monthly challenge. - but just for fun ....

Step back from the screen, look for a little while. You might just see that a three dimensional impossible triangle..


PostPosted: April 13th, 2007, 9:27 pm
by thevoid
did you ever thought about a "origami chain-reaction machine" ?

that would be awesome :)

The problem of weight

PostPosted: April 15th, 2007, 3:54 pm
by firstfold
One of the problems I have encountered in making action models is that oftern the models do not have enough weight or need to be ancored to something to be able to work. Sometimes you need one hand to hold the model down leaving only one more hand to operate the model.

First, I tried attaching the model to the table, but the ties are often specific to the available table (each different table needed digfferent paper ties)and the table might be considered part of the model.

While I am preparing some of the other models for this challenge, I thought you might like to see a solution that I have developed to deal with a need for more weight:

<embed src="" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed>

This solution is all paper, without adhesives and 100% can be recycled.

I will be using this technique for the moving bridge and something similar to make yet another ancient war machine - the trebuchet.

If you have other solutions for giving origami models more weight - let me know,

Chain reaction -

PostPosted: April 15th, 2007, 4:00 pm
by firstfold
Thanks for the idea about chain reaction. Are you thinking about something like a few hundred mouse traps with ping pong balls or did you have something else in mind?

Give me a better picture of what yopu had in mind.

I've already re-invented the wheel (as an octogon) and tried to put a square peg into a round hole (boxy axel into a rounding axel housing) on some of my rolling models. I guess I will have to build a better mouse trap.

PostPosted: April 17th, 2007, 2:06 am
by thevoid
i have meant something like this

YouTube - Chain Reaction Machines

there are many possibilities - with origami that would be awesome i think :wink:

PostPosted: April 17th, 2007, 6:52 pm
by Cupcake
Heres my contribution to this challenge
The impossible triangle!
It's 3D, can anyone figure out how I made it?

PostPosted: April 21st, 2007, 2:17 pm
by Cupcake
Here is the solution:
The triangle is indeed 3D, and nothing is twisted. It simply matters the way you look at it
Here are some other angles-