Stephen Chin
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« on: June 29, 2008, 09:40:55 AM » |
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Hello, I was wondering if anyone has noticed the 4 fingers to open Pennyhedron. Its in Stewart Coffin's book, Chapter 15, Fig 147, right side pic. Yet he makes no mention of it. I made one along with the 2, 3 ,and 6 finger one. The 4 finger one is fun and very unique. Anybody ever notice this puzzle too???....Stephen Chin
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Mark McCallum
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« Reply #1 on: June 29, 2008, 11:46:51 AM » |
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I am looking at the diagram (PWPD)and this is what I see...the left one is actually the more common thumb and forefinger (4 finger)grasp and it is used in the Peanut puzzle. The one on the right is the standard penny with the three finger grasp. The same illustration is given in his new book, "Geometric Puzzle Design" p138 Fig 161.
I'd like to see pictures of what you have.
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Stephen Chin
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« Reply #2 on: July 01, 2008, 09:35:23 AM » |
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Hey Mark,
The right bottom colour pic shows an opened penny, that is the 4 finger each hand opening one I am refering to. Only way is to grab 24 tetras and copy the pic. worth making , and I think its the best one of the lot, Tell me what you think then. Everyone thinks its the 3 finger one, but it is not. Look very closely,,,,,,
Also, sweating on the 2 tier one, will call for other solution when I have suffered enough. I think magnet glueing the missing piece is a good idea. Thanks for all your helpful tips
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Stephen Chin
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« Reply #3 on: July 11, 2008, 08:38:05 AM » |
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Check this out,its 2 hands 4 fingers ,Make 1 and find out,,,cool
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Mark McCallum
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« Reply #4 on: July 11, 2008, 08:46:23 AM » |
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Ok, I understand it now. I have seen pictures of this one before, thanks for posting the pics. How does it stay together? Looks like it will just fall apart into two halves.
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Canuck
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« Reply #5 on: July 11, 2008, 09:15:36 AM » |
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Yeah, I've seen those pics as well but never really gave it much thought, are those pics from Puzzleworld? Like Mark mentioned not sure how well it would stay together on its own? Have you made any Stephen?
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Stephen Chin
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« Reply #6 on: July 12, 2008, 09:26:55 AM » |
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Yes I have made a few, get 24 tetras and try it.Stays together and definitely 4 fingers each to open. Real cool. Just copy the pic. How everyone misses this 4 finger one all these years, I don't understand
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Canuck
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« Reply #7 on: July 12, 2008, 10:10:07 AM » |
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Man, I'm gettin' old, I did make some Pennyhedron's using 24 tetrahedron pieces, however in the 'usual' configuration. The one pictured is bocote:  |
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Scott Peterson
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« Reply #8 on: July 12, 2008, 03:31:04 PM » |
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John - looks like yours are the 3-finger version. You can also make this one from 12 RP's. Cool puzzle though. I had a bowl full of RD's made from 4 C blocks for a while.
Maybe a cool display would be a bowl full of 3- and 4-finger pennyhedrons, all the same size - with one or 2 made out of 4 C-blocks all glued up. I guess that could be considered mean if someone got into solving the bowl full though...
The other thing I often wondered is if several smaller RD's will pack inside a larger hollow RD? I never went too far with this idea though It could be a cool packing problem to fill a hollow pennyhedron with several pieces made up of Coffin blocks of one kind or another.
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Bernhard Schweitzer
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« Reply #9 on: July 12, 2008, 04:20:52 PM » |
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hi Scott
a similar idea solved 5 years ago Josef Pelikan ( died in a car carsh june 2005) with the Design 72 by Stewart Coffin; He found manually 2 different solutions for that Triacontrahedron, made the bigger one on form of a globe and filled it inside with the second solution of the triacontrahedron in small form, absolute great puzzledesign
happy puzzling
Bernhard
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Stephen Chin
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« Reply #10 on: July 13, 2008, 09:25:18 AM » |
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Hey Scott,
I have 2 pennys like that, The shell encloses a fully formed RD, from tetras, L and R. blocks, octa and Cs. Held by small magnets. I use it to show new commers what a RD looks like, its dissection, and later ad ons into different puzzles. Alas, it creates more confusion and headaches to these non puzzle audience, hence I have given up showing them
Bernhard,
If you have a pic or diagram of Pelikans solved Triacontahedron, I would love to see it
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Scott Peterson
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« Reply #11 on: July 17, 2008, 03:33:39 PM » |
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Thanks for the input! I suppose any idea I can think of has been tried in one way or another...but that won't stop me completely! I can see what you mean about being confusing for newcomers. I think rectangular type packing problems are one thing (and sometimes pretty challenging), but then change the geometry a bit and all kinds of cruel possibilities emerge... Cool!  |
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