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Author Topic: Is there a name for this pattern?  (Read 4387 times)
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Derek_VS
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« on: January 10, 2013, 03:27:20 AM »

In 1999 there were two similar crop formations:

http://www.temporarytemples.co.uk/imagelibrary/images-1999-enlarge/39-Windmill-Hill-Wiltshire-16-07-99-Wheat-35mm.jpg

http://www.temporarytemples.co.uk/imagelibrary/images-1999-enlarge/58-West-Kennett-Longbarrow-Wiltshire-04-08-99-Wheat--35mm.jpg

The general pattern seemed like a fractal to me (though I'm no expert).
Using Adobe Illustrator I created a representation of this:


With the white square being the base unit 1, it is a 12x12 grid.
The center square is half of that (6).
Its "offspring" is half of that (3).
And then those squares have offspring which are a third of that (the base unit 1).
The smaller squares were added when I had the theory that it continues on from a third to a quarter,
but that is somewhat off-topic.

Using Fractal Science Kit, I made a L-system representation:

The white squares were added later for visual analysis.
I called the L-system b-order:
Code:
b-order {  ; b-order
angle 8 
axiom [+Fa][-Fa][---Fa][+++Fa]
a=@.5[++Fb][Fb][--Fb]
b=@.33[++Fa][Fa][--Fa]
}
For those wondering what a-order is:
Code:
a-order {  ; a-order
angle 8 
axiom [+Fa][-Fa][---Fa][+++Fa]
a=@.5[++Fa][Fa][--Fa]
}
(These are some of my very first L-systems, so they could be overcomplicated.)

I later stumbled onto another way to create the pattern with FSK.
- General: Orbital / IFS / Strange Attractor
- Orbital Equation: Kotch Snowflake
- Properties: Number of polygon vertices: 4
(update: this pattern is actually half-half-half unlike the crop formations which are half-half-third
see post 14 to visualize)



Something very similar is produced with:
- General: Orbital / IFS / Strange Attractor
- Orbital Equation: Sierpinski N-gons
- Properties: Number of polygon vertices: 4
- Center point: checked

So does this pattern (fractal?) already have a name?
Thanks!
« Last Edit: January 13, 2013, 04:19:08 AM by Derek_VS » Logged
kram1032
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« Reply #1 on: January 10, 2013, 02:23:58 PM »

http://en.wikipedia.org/wiki/Koch_snowflake#Variants_of_the_Koch_curve
Quadratic Koch Snowflake?
http://en.wikipedia.org/wiki/T-square_%28fractal%29
T square?

I guess it's one of those two.

In fact, I think your first image is a T-square while the other two rather are the 90° variations of the Koch Snowflake - the quadratic Koch Snowflake.

The two fractals seem to be duals of each other.
« Last Edit: January 10, 2013, 02:27:33 PM by kram1032 » Logged
Derek_VS
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« Reply #2 on: January 10, 2013, 08:08:06 PM »

Hi kram,
Thanks a lot for pointing those out.
The T-square is definitely the L-system I was calling a-order (but did not include an image):


However, what I meant to show in the original post was that the two crop formations
follow the pattern of half-half-third, while the T-square is half-half-half. The Quadratic Koch seemed to also follow
the half-half-half pattern, although it was difficult to analyze with the method I have been using.
I guess I'll call the pattern in the original post: "b-order T-square", for now.

Interestingly, another crop formation appeared in 2005 that was the inverse of the two from 1999.
http://www.temporarytemples.co.uk/imagelibrary/images-2005-enlarge/20-East-Field,-Wiltshire-03-07-05-Wheat-OH.jpg

In other words: the pattern was 12-4-2-1, or third-half-half. An inverted b-order T-square... ;-]

« Last Edit: January 13, 2013, 04:23:21 AM by Derek_VS » Logged
kram1032
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« Reply #3 on: January 10, 2013, 08:40:04 PM »

I see.
In that case I'm pretty sure that there is no name for it. It's just a generalization of a whole family of imaginable T-square patterns
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Derek_VS
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« Reply #4 on: January 10, 2013, 08:56:44 PM »

That makes sense.

I wonder if there is any way to apply these patterns to computer architecture,
perhaps for heat dispersion. I believe fractals will be the foundation for future technology;
that and bio-mimicry (which I'm not sure can be separated from fractals).
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cKleinhuis
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« Reply #5 on: January 10, 2013, 09:07:22 PM »

check this out, not equal, but similar, the structure is called minkowski island, the special thing about this antenna is that it never crosses/touches:
http://en.wikipedia.org/wiki/Fractal_antenna


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divide and conquer - iterate and rule - chaos is No random!
Derek_VS
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« Reply #6 on: January 10, 2013, 09:36:25 PM »

This was interesting:
Quote
Many fractal element antennas use the fractal structure as a virtual combination of capacitors and inductors.
This makes the antenna so that it has many different resonances which can be chosen and adjusted by choosing the proper fractal design.

I appreciate the information!
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cKleinhuis
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« Reply #7 on: January 10, 2013, 09:40:53 PM »

they are awesome cheesy and since the invention no need for sticking out antennas in mobile phones are needed ,
additionally they can deal with many frequencies ( wifi, bluetooth, umts ... )

i need to advertise my little show where i mention them as well:
<a href="http://www.youtube.com/v/rRkWpB8oUwE&rel=1&fs=1&hd=1" target="_blank">http://www.youtube.com/v/rRkWpB8oUwE&rel=1&fs=1&hd=1</a>
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divide and conquer - iterate and rule - chaos is No random!
Alef
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« Reply #8 on: January 11, 2013, 09:53:57 AM »

Vicsek fractal
http://en.wikipedia.org/wiki/Vicsek_fractal






EDITED:
"Fractal Growth Phenomena" 2nd Edition
By (author): Tamás Vicsek (Eötvös Univ., Budapest)
Sounds as it is a name of author
http://www.worldscientific.com/worldscibooks/10.1142/1407
« Last Edit: January 11, 2013, 04:07:05 PM by Alef » Logged

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s31415
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« Reply #9 on: January 11, 2013, 03:56:02 PM »

Was the person who wrote the Wikipedia article named Vicsek? cheesy There is no information about where this name comes from, and the entry in MathWorld does not mention it at all. Maybe it's better to stick with box fractal...

Sam
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Ryan D
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« Reply #10 on: January 11, 2013, 05:12:23 PM »

Was the person who wrote the Wikipedia article named Vicsek? cheesy There is no information about where this name comes from, and the entry in MathWorld does not mention it at all. Maybe it's better to stick with box fractal...

The fractal is named after Tamás Vicsek.

http://sins.xaoc.ru/pdf/articles/articles_e001.pdf
http://hal.elte.hu/~vicsek/publications/

Ryan
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s31415
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« Reply #11 on: January 11, 2013, 05:50:23 PM »

Ah great. Sorry for raising doubts.

Sam
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Derek_VS
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« Reply #12 on: January 12, 2013, 09:19:31 AM »

Thanks for the extra info guys.

I was thinking about the statement:

Quote
...it has a boundary of infinite length bounding a finite area.

(regarding the T-square)

It seems that any T-square variation, or pattern inline with that statement,
could be used as a structure for efficient, high capacity, data storage.
I also see no reason why it would need to be limited to two dimensions.
Perhaps a T-square-cube of sorts.

I found, what I assume is, a more traditional approach to the T-square L-system here:
http://www.wolframalpha.com/input/?i=t-square+fractal

I plugged it into Fractal Science Kit, bent it in half and added a color pattern for fun.



I'll save all my Photoshop fun for deviantArt. ;-]
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kram1032
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« Reply #13 on: January 12, 2013, 11:32:48 AM »

Well, yeah, the reason for the ridges in the brain is increased storage and data streaming capability.
And in fact, the cerebellum, which looks like a small copy of the whole brain, is the place where motion is processed and is even faster and can take more information.
It's shaped small and ridge-heavy to account for short response time and high data traffic.

So of course this kind of fractal is good for surface-based data storage
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Derek_VS
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« Reply #14 on: January 12, 2013, 06:09:43 PM »

Thank you for furthering my point kram.

First idea:

Imagine a T-square lying flat on a table, and then extend it upwards (as though you are stacking many copies of it).
Then fill most of the space with inversions, or the Koch fractal (equal in height).
One could be used for the storage and the other for the flow of data.

Here's one possible top view, using the standard T-square:



I realized that my original claim that the Koch fractal followed the half-half-third pattern is erroneous.
It does in fact compliment the standard T-square.
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