Structural Graphics has patented this rotating flexagon that has been around a lot longer than they have. How is it possible that they have been able to patent...
662
toppingleslie
Jan 5, 2010 4:09 am
Kathy This looks like a version of the double hinged truncated digon flexagon in 'Flexagons Inside Out', p. 88. Les Pook...
Robin Belated thanks for your kind remarks. 'Serious Fun with Flexagons' was much longer than originally planned, hence the price. I'm sure that there are a...
665
Bruce McLean
sir_roberttb...
Jan 12, 2010 3:20 am
All, I spent the break finishing a very colorful hexahexaflexagon applet that was inspired by my colleague, Emil Iacob. We were assisted by students Chasen...
666
Bruce McLean
sir_roberttb...
Jan 12, 2010 3:20 am
And then the URL. http://math.georgiasouthern.edu/~bmclean/flex/index.html ============= ===================== Bruce McLean = == === ===== ========...
667
Bruce McLean
sir_roberttb...
Jan 12, 2010 7:10 pm
All, I wish I would have said "If you're industrious". Bruce...
668
Kathy Knapp
kathyknapp2003
Jan 26, 2010 3:01 am
Juergen, I found a simpler way to construct this flexagon. http://www.victorineoriginals.com/images/samples/instructions/neverendingcard.html I think it ends...
669
Kathy Knapp
kathyknapp2003
Jan 26, 2010 3:05 am
Les, I am not sure how I over looked your e-mail, but I am getting to it, and I am sending along a link to this type of flexagon that I taught at our local...
670
Les Pook
toppingleslie
Jan 29, 2010 12:06 am
I've received a comment on the Thrice Three=Fold Flexagon. To see the comment, and my response, go to...
671
Les Pook
toppingleslie
Jan 29, 2010 12:06 am
Kathy I've made up a never ending card from your instructions, and can now see that is a member of the family of flexagons, first described by Engel, who...
672
Kathy Knapp
kathyknapp2003
Feb 11, 2010 1:15 am
I will just have to save up my pennies to purchase Serious fun with flexagons. I am intrigued and hopefully can keep learning. Nice to know that the reason...
673
Ralph Jones
r_flex10
Feb 12, 2010 4:19 am
Thrice Threefold Flexagon – an alternate flex Using the net described in SF12.23(3) produces a three-triangle triangle 60-60-60 with leaves 1A-1A(3)-1A(3)....
674
Ralph Jones
r_flex10
Feb 14, 2010 7:15 pm
Equivalent Flexagons In the book “Serious Fun with Flexagons” appear these four flexagons: 1) net in SF9.14, type A; 2) net in SF9.17a, type BA; 3) net in...
675
Kathy Knapp
kathyknapp2003
Feb 14, 2010 7:15 pm
This was posted on the origami list, and the fact that you can insert your own photos and then it prints out the pattern is neat. It uses glue , but is a...
676
Ralph Jones
r_flex10
Feb 16, 2010 3:09 am
Partial diagram SF9.15 The diagram SF9.15 (figure 9.15 in “Serious Fun with Flexagons”), “Main position sequence diagram for the fundamental irregular...
677
Les Pook
toppingleslie
Feb 16, 2010 3:11 am
Ralph Thanks very much for your comments on 'Serious Fun with Flexagons' in Messages Nos. 673 and 674. I should of course have included 'partial' in the...
678
Ralph Jones
r_flex10
Feb 18, 2010 3:39 am
60-120 Rhombus flexagons Looking at SF10.50 (figure 10.50 in “Serious Fun with Flexagons”), I wondered why the obvious ring of three 60-120 rhombi was...
679
toppingleslie
Feb 18, 2010 11:23 pm
Ralph I've made up your rhombus flexagon. I agree that it could be called a 'flat regular odd edge ring of three rhombi flexagon'. I notice that there are two...
680
Ralph Jones
r_flex10
Feb 20, 2010 6:01 am
For this discussion, I am looking at the 12-leaf, 60-120 rhombus flexagon from SF10.60 (figure 10.60 from Les Pook’s “Serious Fund with Flexagons”). As...
681
Ralph Jones
r_flex10
Feb 20, 2010 6:02 am
Thank you, Les, for your feedback. I’m not sure I completely understand the computation of torsion per sector. You said “Yes, flexagon variants folded from...
682
Ralph Jones
r_flex10
Feb 21, 2010 10:18 pm
Hi Les, More to my questions about torsion. On SFp235, you say about SF10.55 that the torsion per sector is 2. Would the torsion for appearance SF10.50a then...
683
toppingleslie
Feb 21, 2010 10:18 pm
Ralph The torsion of a sector can always be determined theoretically, but this is tricky. All the torsions given in SF were obtained by unfolding a sector and...
684
toppingleslie
Feb 21, 2010 10:18 pm
Ralph This is a fascinating flexagon. I found some of the flexes and positions you describe, but didn't include them: SF is about twice as long as originally...
685
Ralph Jones
r_flex10
Feb 24, 2010 3:35 pm
I am wondering why the search capability works so poorly. If I search for "thrice", I get only #396,397 but not 670 nor 673, for example. If I do an advanced...
686
toppingleslie
Feb 24, 2010 3:39 pm
Ralph The answer to your first question is yes. On the second point, I made up your flexagon and followed your directions, and found that the torsion of the...
687
Kathy Knapp
kathyknapp2003
Feb 24, 2010 5:27 pm
... I am wondering why the search capability works so poorly. Ralph, not on this site, but last night on the British Origami Society's site, I too, had a...
688
Ralph Jones
r_flex10
Feb 24, 2010 9:53 pm
The flexagons described in IO-9.12 and SF6.10 are enantiomorphs (mirror images). {I refer to labeled nets in figures from “Flexagons Inside Out” and...
689
toppingleslie
Feb 25, 2010 7:24 pm
Ralph I changed the labelling scheme in SF so that I used the standard face numbering scheme. This clarifies the relationship to first order fundamental...
690
Ralph Jones
r_flex10
Feb 27, 2010 12:20 am
Thanks, Les, for your feedback. I’m going to try to generalize your comment for my current understanding. Maybe it’s incorrect. I intend this message to be...
