Message #2381

From: Roice Nelson <>
Subject: Re: [MC4D] Re: Escher-style puzzle on Hyperbolic plane
Date: Sat, 08 Sep 2012 22:10:02 -0500

Hi Nan,

I like your idea to permute entire tiles around. (Avoiding slicing all
together would likely make things easier to program too.)

On your case (2), since the wings/tails meet at an edge of the underlying
{3,8} tiling, a natural way to do it would be as a 2-cycle rotation. Seems
like that could make the resulting puzzle too easy, but maybe not (say, if
you don’t allow 2-cycles around the bird bellies and backs). I don’t see a
way to do an 8-cycle here either, since the {3,8} doesn’t have 8-fold
symmetry around an edge.

Another idea would be to have a permutation which took a strip of birds on
an h-line and translated them. In combination with your 8-cycle rotation
around a vertex, this could make an interesting and challenging puzzle.

Also, I think the "no slicing" approach to puzzles you’re describing could
have application to a {3,3,8} puzzle :D


On Thu, Sep 6, 2012 at 12:59 AM, schuma <> wrote:

> Hi Roice,
> I don’t have a clear vision about how MagicTile supports Escher-style
> images. I understand it’s tons of coding to do. I just think that if you
> make Escher-style images in MT, it’ll attract more people because it’s more
> artistic. Maybe for public (or common geeky people), Escher’s paints are
> more famous than the term "hyperbolic tessellation".
> I can imagine two possible ways to introduce the images.
> One way is that the stickers are painted with the images, and the cuts are
> circles as before. This is like the Rubik’s cubes with picture stickers. I
> think this is what you meant.
> The other way is to say each bird/rabbit/elephant/etc is a piece with
> irregular shape, and mimic the movement of the pieces in Circull. In the
> first level of Circull
> two adjacent birds can swap. There are two cases: (1) two birds’ beaks
> meet at one point. In this case the birds will turn by 45 deg around the
> beaks. (2) two birds’ wings and tails meet each other. In this case the
> birds will turn by 180 deg around the tails.
> Case (1) can be made in the twisty puzzle: maybe all eight birds whose
> beaks meet at a point can rotate as a 8-cycle. Because the cut is not a
> perfect circle but a zig-zag "circle", the tails of moving birds may sweep
> over the other birds’ wings. But I’ll think it’s OK.
> Case (2) is more complicated. I don’t see a good way to make a 8-cycle
> version of it. If we don’t allow this kind of move, the twisty puzzle would
> be trivial. But we can make our own rules any way.
> Any thoughts?
> Nan
> — In, Roice Nelson <roice3@…> wrote:
> > You asked about whether MT could support twisty puzzles of this style.
> By
> > that, do you mean puzzles where the faces are Escher-style images? It
> > would take coding since the program currently has no concept of sticker
> > orientations, but it’d certainly be possible with some effort.