Someone please explain a closed sink
Forum rules
READ: The Origami Forum Rules & Regulations
READ: The Origami Forum Rules & Regulations
-
- Junior Member
- Posts: 113
- Joined: June 7th, 2005, 1:30 pm
Someone please explain a closed sink
I have been origami-ing for a while now and have started looking for more advanced models, and one thing keeps stopping me in my tracks. the infamous closed sink. There are a couple of models in "folding the universe" by engels which i cannot do thanks to the poor explanation of this type of fold in the intro. Most recently i have been thwarted in the making of the cookie monster (http://www.keconnect.co.uk/~rglynn/cookie.pdf) because of another closed sink... i can open sink with no problems but it seems weird to me to ask for a closed sink... especially when you can open the folds to get a sink anyway... is the result any different? i get the idea it must be but the diagrams dont help. Does anybody know of an example somewhere which might help me practise this fold?
and while we're at it ive heard a lot about something called a closed unsink, but have never seen an example... any ideas?
thanks a lot,
Hermann
and while we're at it ive heard a lot about something called a closed unsink, but have never seen an example... any ideas?
thanks a lot,
Hermann
blahblahblahboringsignatureblahblahblah
In some cases it can be important to fold a closed sink to lock the model. This is shown good in the third picture, were the layers of the closed-sink-side hold together as well, while the layers of the open-sink-side are loosey apart. But sometimes it is only an esthetic question if you make a closed sink or an open sink. It depends on the Model and the following steps. Than you can choose it for yourself which kind of sink you use.
-
- Junior Member
- Posts: 113
- Joined: June 7th, 2005, 1:30 pm
excellent advice, thanks for the pictures... i can see why they were needed... it's hard to explain in words isnt it? but i copied your pictures just now and i see what you mean about locking things together. could be very useful, although a little messy sometimes... i guess that gets better with practise.
thanks again, i can see this forum is going to be well worth joining
thanks again, i can see this forum is going to be well worth joining
blahblahblahboringsignatureblahblahblah
-
- Junior Member
- Posts: 113
- Joined: June 7th, 2005, 1:30 pm
looking at the underside of the closed sink (the doubly closed one, shown in the third picture), i notice there is more than one way for the folds to lie... the flaps at the back can be either on the same side as each other or opposite sides. Presumably most of the time you dont get much choice about this as the back isnt often accessible, but i noticed i could reassemble this sink in three ways, the most pleasing being the one with the flaps on opposite sides... do these arrangements have names or uses? has anyone got a clue what i'm writing about any more?
blahblahblahboringsignatureblahblahblah
-
- Senior Member
- Posts: 443
- Joined: April 18th, 2005, 7:27 pm
- Location: Vancouver, BC, Canada
- Contact:
For closed sinks, it usually is not important how the internal layers are arranged. Usually, you should try for the most uniform layout possible, to avoid unnecessary thickness on one side. There are few models where they arrangement of these layers is important, and these are usually indicated in the diagrams.
http://nic-nac-project.de/~origami/inde ... ge=4&str=3 are some pictures. (but page not in english)
Closed sinks are a pain (esp. with foil), but they did lead to one of my favorite quotes in Origami Design Secrets by Robert Lang:
A closed sink is an inversion of a point, but in such a way that it is not possible to open the point flat while performing the maneuver. This makes closed sinks extremely hard to perform. In fact, from a strictly mathematical viewpoint, it is impossible to perform a closed sink using a finite number of folds (and what is impossible in mathematics is usually pretty hard in reality).
picture three
the third picture on there is the closed sink that I've seen before most commonly. It didn't take me that long to learn, I'll give a simple technique:
First valley fold the tip down where you want the closed sink.
Then Spread-squash the tip.
Then invert it. Sink it in.
If you've made the very basic, fundamental, origami crane, remember pulling the wings apart to make the body round? and see how the tip squashes open, but not all the way?
For a closed sink, do the squash all the way and push it inside.
Also, you must have diagrams for something with pictures, so, combine the wonderful advice of all the people who posted here and your diagrams. Happy folding!
First valley fold the tip down where you want the closed sink.
Then Spread-squash the tip.
Then invert it. Sink it in.
If you've made the very basic, fundamental, origami crane, remember pulling the wings apart to make the body round? and see how the tip squashes open, but not all the way?
For a closed sink, do the squash all the way and push it inside.
Also, you must have diagrams for something with pictures, so, combine the wonderful advice of all the people who posted here and your diagrams. Happy folding!
STOP CALLING THEM PATTERNS!!!!!
THEY ARE DIAGRAMS!!!!!
-- omzig89
THEY ARE DIAGRAMS!!!!!
-- omzig89
- wolf
- Forum Sensei
- Posts: 733
- Joined: June 7th, 2003, 7:05 pm
- Location: Not locatable in this Universe
- Contact:
Re: picture three
I'll call the third picture a partial closed sink. Perhaps sinks can be distinguished by the perimeter of the sunken area - a totally open sink is one where the perimeter is maximised, and a totally closed sink is one where the perimeter is minimised.
Doesn't that just give you an open sink?omzig89 wrote:and see how the tip squashes open, but not all the way?
For a closed sink, do the squash all the way and push it inside.
-
- Junior Member
- Posts: 113
- Joined: June 7th, 2005, 1:30 pm
Re: picture three
I dont understand what you mean. it seems you might be suggesting that i break copyright lawsomzig89 wrote:Also, you must have diagrams for something with pictures, so, combine the wonderful advice of all the people who posted here and your diagrams. Happy folding!
blahblahblahboringsignatureblahblahblah
no, not suggesting copyright breaks
I just meant that you combine ideas from different sources in your mind to help you fold things correctly. Also, I may have made a little mistake explaining the closed sink as well. I'll have to fix that.
STOP CALLING THEM PATTERNS!!!!!
THEY ARE DIAGRAMS!!!!!
-- omzig89
THEY ARE DIAGRAMS!!!!!
-- omzig89
Re: picture three
You are right my friend, I am currently thinking of the right way to explain the closed sink. Stay tuned for more alerts.wolf wrote:Doesn't that just give you an open sink?
STOP CALLING THEM PATTERNS!!!!!
THEY ARE DIAGRAMS!!!!!
-- omzig89
THEY ARE DIAGRAMS!!!!!
-- omzig89