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Oct 12, 2007 13:00

This is an interesting illusiony thing from my friends list. My roommates and I stared at it for awhile last night. It broke us.

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lo5an October 13 2007, 04:52:06 UTC
Also, how about the word "anticlockwise"?

Yeah. the left-vs-right brain stuff is bunk. I mean, I'm willing to believe that hemisphere dominance predisposes you to a left or right interpretation, but I think its probably more to do with some sort of slight perceptual asymmetry than "logical minds prefer counter clockwise."

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anonymous October 13 2007, 14:24:24 UTC
I logged in and it posted my comment before I was done!

Anyway, I'm more silly than logical, I think, and I predominantly see her as counter clockwise, so I agree that the interpretation is crap. I don't know if her direction was due to pre-conditioning from the text or the slight angle of the figure the first time I glanced at it. Who knows. I do know that she switched direction like crazy for me, but I can't consciously make her switch.

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krieg_hund October 15 2007, 16:16:54 UTC
I don't understand this at all. Clockwise and anti-clockwise are only relevant on a plane. The viewer is at a 90d angle from the dancer, so the description is meaningless.

If you can convince yourself you're above or below her midsection, then your definition of her motion changes. Just scroll the image to the top or the bottom of the screen.

Tangentally, I'm left handed, so I'm supposed to be more right brained than most. I do have some of the traits listed. Of course, I'm also a Taurus and a Tiger and I have some of the traits that are usually listed for them, as well.

I gotta get to school...I have a 3D modeling quiz in 45 minutes!

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lo5an October 15 2007, 16:32:23 UTC
Consider the clock face to be the surface she's spinning on. A clock on its side is still spinning clockwise. I think the ambiguity centers on which leg you parse as left and which you parse as right.

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krieg_hund October 15 2007, 16:36:54 UTC
Draw a clockwise arrow on a piece of paper in marker.
hold it flat.
viewed from the top, it's clockwise.
viewed from the botton, it's counter clockwise.

A clock on its side is only spinning clockwise if you're in front of it. If it's made of glass and you're behind it, it's spinning counter clockwise.

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lo5an October 15 2007, 16:51:44 UTC
That's only if you're looking at the 2d projection of the motion from 3 space. If your clock is a 3d object, then its got a face and a back, even if its transparent.

Clockwise and counter clockwise motion, to me, would imply angular motion about an axis defined by a ray tangent to a plane of reference :-)

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auranja October 15 2007, 22:56:52 UTC
lo5an October 16 2007, 00:42:19 UTC
Amusingly, they're all clockwise for me, even with the "suggestion lines".

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krieg_hund October 15 2007, 23:08:48 UTC
Yah, that's a pretty good definition. However, I also think clockwise/anticlockwise (to use the British expression) can be considered relative to the viewer. Which would just go to show why we use math, because language is too imprecise.

I've been spending way too much time in the past 2 months spinning architectural features, a process that requires me to be aware of which direction I'm looking at them from. (Turning something 30d in top view yelds the same result as -30d in bottom view.) Of course, that is in CAD, not real life.

Anyway, all this is a tangent. I looked at the image long enough that it reversed. It's a nice variation of the perspective illusion, the 'is it a box in a corner or a cube with a block taken out' one.

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