Directionality of spin and the relativity of motion

The Dervish Girl:
(click on image to activate spin)





This is quite amazing...

If you see this lady turning clockwise you are using your right brain.If for you she is spinning counterclockwise, you are using the left brain.Some people do see both ways, but most people see it only one way.See if you can make her go one way and then the other by shifting the brain's current.BOTH DIRECTIONS CAN BE SEEN
Experimentation has shown that the two different sides, or hemispheres, of the brain are responsible for different manners of thinking. The following table illustrates the differences between left-brain and right-brain thinking:

Left Brain
Logical
Sequential
Rational
Analytical
Objective
Looks at parts

Right Brain
Random
Intuitive
Holistic
Synthesising
Subjective
Looks at Wholes


Most individuals have a distinct preference for one of these styles of thinking. Some, however, are more whole-brained and equally adept at both modes. In general, schools tend to favor left-brain modes of thinking, while downplaying the right-brain ones. Left-brain scholastic subjects focus on logical thinking, analysis, and accuracy. Right-brained subjects, on the other hand, focus on aesthetics, feeling, and creativity.I found that if I just look at her feet, she will switch direction! If I closed my eyes and then reopen them sometime I can see a change in direction.I can only see her going clockwise...Jay could only see her going counter-clockwise, until he looked at her feet! Weird!Most individuals have a distinct preference for one of these styles of thinking. Some, however, are more whole-brained and equally adept at both modes. In general, schools tend to favor left-brain modes of thinking, while downplaying the right-brain ones. Left-brain scholastic subjects focus on logical thinking, analysis, and accuracy. Right-brained subjects, on the other hand, focus on aesthetics, feeling, and creativity.I found that if I just look at her feet, she will switch direction! If I closed my eyes and then reopen them sometime I can see a change in direction.I can only see her going clockwise...Jay could only see her going counter-clockwise, until he looked at her feet! Weird!
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This is a mind-boggling illusion!

I can see her spinning both clockwise and then anti-clockwise!The change in direction ocurred when I closed and then reopened my eyes.I immediately considered that the image/video is pre-programmed to change direction of spin,in order to fool the viewer into thinking that he is causing the change.....or am I really switching back and forth between my left and right brain (that is, changing my way of seeing)?Then I realized I'd often observed something similar (perhaps identical) : While watching a fast-moving car if you focus on the wheels ,they appear to be rotating backwards.
(Stroboscopic Effect) Often the direction of rotation seems to change even as you are watching.
Does the illusion affect only two-dimensional images? What about 3-dimensional objects ,such as the spin of subatomic particles and galaxies? Is apparent spin direction really determined by what hemisphere of the brain we perceive with?If we observe a spinning sphere(such as the earth) or disc from above(in contradistinction to side view), it spins in one direction (say clockwise), But the same sphere observed from below is spinning counterclockwise.Clearly spin directionality is relative to one's point of view or observational frame of reference.So maybe the direction of spin that one perceives depends upon whether we can visualize/imagine viewing this lady from above or from below .Perhaps what we are switching is our point of view.
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The Relativity of Motion

The relativity of motion can be demonstrated with the following thought experiment.
We have all experienced that momentary confusion while sitting in our vehicle in traffic --of experiencing relative motion but being uncertain whether we are moving forward or whether we are stationary and everything else around us is moving backwards toward us.The brain quickly checks a few more reference points in an effort to acquire more information in order to understand what's happening and be able to respond appropriately to the event.

Supposing a photon of light is emitted from the earth and we hop onto it.
Has the photon been emitted by the earth or has the earth been ejected from the photon?What we know is that the relative speed between the photon and the earth is 186,282 miles/second. The two objects are separating at this speed ,or the space /distance between them is expanding/increasing at this speed(186,282 miles/second).*If we observe/experience (or even just visualize/imagine)this event from the point of view of the earth we perceive a photon travelling away from the earth at the speed of light.But if we have hopped onto the photon prior to it's departure(separation from the earth)and have thereby adopted the photon as our home frame of reference ,it would appear that we are stationary(zero velocity) and the earth is receding from us at the speed of light. Since the earth is travelling away from us at light speed and if we say that only light can travel at light speed ,then the only possible perception we could have of the earth --if we could detect it at all-- is as light! We would observe it as being light.
*Motion can be defined as the rate of change in the distance(space) between two objects. This definition places focus upon the expansion or contraction of the space between objects rather than on the objects themselves.


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http://scienceblogs.com/cognitivedaily/2008/02/what_illusions_tell_us_about_t.php



The anatomy of an illusion -- and what it tells us about the visual system
Category: Color perception • Perception • Research
Posted on: February 19, 2008 2:22 PM, by Dave Munger