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Spinning Dancer Illusion - explained!
Topic Started: Apr 25 2011, 06:03 PM (797 Views)
George K
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Finally
http://mathfail.com/2011/04/the-spinning-dancer-illusion.html

Posted Image

The illusion was created by web designer Nobuyuki Kayahara and the question is "Which direction is the dancer spinning?" That is, is the dancer is spinning clockwise or counter-clockwise?

"If the foot touching the ground is perceived to be the left foot, the dancer appears to be spinning clockwise (if seen from above); if it is taken to be the right foot, then she appears to be spinning counterclockwise."


A nice graphic that illustrates how the dancer can be observed as spinning in either direction is below. By simplying adding some lines to the original image you you can give direction to the dancer. The left image shows the dancer spinning clockwise, while the right image shows the dancer spinning counter-clockwise.

Posted Image
A guide to GKSR: Click

"Now look here, you Baltic gas passer... "
- Mik, 6/14/08


Nothing is as effective as homeopathy.

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apple
one of the angels
my favorite illusion ever!
it behooves me to behold
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ivorythumper
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I am so adjective that I verb nouns!
very cool -- I was working to force boot my brain to reverse the direction.
The dogma lives loudly within me.
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Luke's Dad
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Emperor Pengin
Seeing the three at the bottom really screws with me. You can choreograph them.
The problem with having an open mind is that people keep trying to put things in it.
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Improviso
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HOLY CARP!!!
ivorythumper
Apr 25 2011, 06:44 PM
very cool -- I was working to force boot my brain to reverse the direction.
Try blinking. Every time I blink, they reverse.
Identifying narcissists isn't difficult. Just look for the person who is constantly fishing for compliments
and admiration while breaking down over even the slightest bit of criticism.

We have the freedom to choose our actions, but we do not get to choose our consequences.
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Larry
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Mmmmmmm, pie!
The problem is, it IS a different leg on the ground in the left and right pictures.

Of the Pokatwat Tribe

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Optimistic
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HOLY CARP!!!
What helps me:

looking at the 3 image set, where the two views are clearly distinguished, squint, so that you canīt see the colored lines outlining the legs. When I squint, all three images look the same.
PHOTOS

I must have a prodigious quantity of mind; it takes me as much as a week, sometimes, to make it up.
- Mark Twain


We shall not cease from exploration
And the end of all our exploring
Will be to arrive where we started
And know the place for the first time.
-T. S. Eliot
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Larry
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Mmmmmmm, pie!
Ok, I see where I went wrong. If you only look at the one without the colored lines, it can be seen either way.. yep.

Of the Pokatwat Tribe

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The 89th Key
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All I know is that it looks like she's a bit cold. :)
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KlavierBauer
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HOLY CARP!!!
This is similar to the "mask" illusion - this same thing can happen if you have a 3D mask - your brain can't tell which side is the "inside" of the mask, and which side is the "outside." It wants so desperately to create a face out of the geometry, that it will do so, even though it's a concave surface, and in reality looks nothing like the face.

Mask Illusion
"I realize you want him to touch you all over and give you babies, but his handling of the PR side really did screw the pooch." - Ivory Thumper
"He said sleepily: "Don't worry mom, my dick is like hot logs in the morning." - Apple

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Copper
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Shortstop
That is similar to the hidden "scary" ghost in this car commercial

Look closely when it is behind the tree.

http://www.youtube.com/watch?v=HqGsT6VM8Vg


The Confederate soldier was peculiar in that he was ever ready to fight, but never ready to submit to the routine duty and discipline of the camp or the march. The soldiers were determined to be soldiers after their own notions, and do their duty, for the love of it, as they thought best. Carlton McCarthy
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KlavierBauer
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HOLY CARP!!!
The ghost one works best if you watch it full screen - hard to see otherwise.
"I realize you want him to touch you all over and give you babies, but his handling of the PR side really did screw the pooch." - Ivory Thumper
"He said sleepily: "Don't worry mom, my dick is like hot logs in the morning." - Apple

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