A question from google.
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Ramanan Sivan wrote:
Its because your eyes are placed horizontally, if your eyes were placed vertically when you stand in front of a mirror you should see everything inverted top to bottom.
So, if I turn my head 90º, I should see everything inverted top to bottom? From the Churchdown Parish Magazine: "Would the Congregation please note that the bowl at the back of the Church, labelled 'For The Sick,' is for monetary donations only."
If you turned your head 90 degrees and your eyes were also flipped vertically then it would be inverted top to bottom, yes. I read this in that puzzle book "How to move Mt Fuji", its probably lying around somewhere, I can tell you in more detail if I find it. "One of the Georges," said Psmith, "I forget which, once said that a certain number of hours' sleep a day--I cannot recall for the moment how many--made a man something, which for the time being has slipped my memory."
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Its because your eyes are placed horizontally, if your eyes were placed vertically when you stand in front of a mirror you should see everything inverted top to bottom. "One of the Georges," said Psmith, "I forget which, once said that a certain number of hours' sleep a day--I cannot recall for the moment how many--made a man something, which for the time being has slipped my memory."
BS. It has nothing to do with the orientation of your eyes. I t is simply because the light rays do not cross on their way to and from the mirror, so what was on the left appears on the same side of the mirror. If on the other hand, you walkked to the mirror and turned to face where you were befor, you would have to ROTATE 180 degrees to face the other direction. The mirror, on the other hand, reflects light on the left back to the left, on the top back to the top, etc. creating an appearent 180 degree rotation about YOUR axis of symmetry. If your eyes were located one above the other along the midline of your face, it would still apperar that left and right were exchanged, not top and bottom. Absolute faith corrupts as absolutely as absolute power Eric Hoffer All that is necessary for the triumph of evil is that good men do nothing. Edmund Burke
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BS. It has nothing to do with the orientation of your eyes. I t is simply because the light rays do not cross on their way to and from the mirror, so what was on the left appears on the same side of the mirror. If on the other hand, you walkked to the mirror and turned to face where you were befor, you would have to ROTATE 180 degrees to face the other direction. The mirror, on the other hand, reflects light on the left back to the left, on the top back to the top, etc. creating an appearent 180 degree rotation about YOUR axis of symmetry. If your eyes were located one above the other along the midline of your face, it would still apperar that left and right were exchanged, not top and bottom. Absolute faith corrupts as absolutely as absolute power Eric Hoffer All that is necessary for the triumph of evil is that good men do nothing. Edmund Burke
Rob Graham wrote:
an appearent 180 degree rotation about YOUR axis of symmetry
Your axis of symmetry is because your eyes are placed left to right isn't it ? If your eyes were placed top to bottom and that's how your brain processed images then your axis of symmetry would be vertical and everything would appear rotated about a vertical axis for you. That's what I meant. "One of the Georges," said Psmith, "I forget which, once said that a certain number of hours' sleep a day--I cannot recall for the moment how many--made a man something, which for the time being has slipped my memory."
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one of my friends who recently attended an interview of google, had a boot with the very first question. the question was Q>when you look into a mirror , your left becomes right and your right becomes left. but why your top doesn't become bottom(leg!) and bottom become top. wby this reverse look happens only for left-right thing?? A: :~ :doh: Quit! :( how about u?
"But your mind is very complex, very tricky. It makes simple things complicated. -- that's its work. And for centuries it has been trained for only one thing: to make things so complicated that your life becomes impossible."- Osho
--[V]--
a mirror image is a Z-axis rotation, not an X or Y axis rotation. Cleek | Image Toolkits | Thumbnail maker
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Rob Graham wrote:
an appearent 180 degree rotation about YOUR axis of symmetry
Your axis of symmetry is because your eyes are placed left to right isn't it ? If your eyes were placed top to bottom and that's how your brain processed images then your axis of symmetry would be vertical and everything would appear rotated about a vertical axis for you. That's what I meant. "One of the Georges," said Psmith, "I forget which, once said that a certain number of hours' sleep a day--I cannot recall for the moment how many--made a man something, which for the time being has slipped my memory."
Ramanan Sivan wrote:
Your axis of symmetry is because your eyes are placed left to right isn't it ?
No, your eyes are a small part, but not the deterining feature of your axis of symmetry. The whole "illusion" is caused by the fact that the light is reflected without rotation (or crossing left to right), but when you face another person, they rotate to face you, putting their left on your right. It has nothing to do with how your brain processes the information, but rather with the simple physics of reflection. It is your expectation of left and right that is wrong, not the refelction. You expect your reflection to have had to rotate to face you, but it does not. Absolute faith corrupts as absolutely as absolute power Eric Hoffer All that is necessary for the triumph of evil is that good men do nothing. Edmund Burke -- modified at 11:25 Monday 26th December, 2005
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a mirror image is a Z-axis rotation, not an X or Y axis rotation. Cleek | Image Toolkits | Thumbnail maker
Exactly. But the observer mis-interprets the z-axis inversion as a rotation about the y axis. Absolute faith corrupts as absolutely as absolute power Eric Hoffer All that is necessary for the triumph of evil is that good men do nothing. Edmund Burke
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a mirror image is a Z-axis rotation, not an X or Y axis rotation. Cleek | Image Toolkits | Thumbnail maker
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it's not a rotation around the Z-axis, it's a rotation of the Z-axis. i suppose "inversion" is a better word here - the Z-axis is inverted. in the real world, your Z-axis points from you into the mirror. in the mirror image, the Z-axis points from the mirror, towards you. the other two axes aren't changed. Cleek | Image Toolkits | Thumbnail maker -- modified at 12:13 Monday 26th December, 2005
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it's not a rotation around the Z-axis, it's a rotation of the Z-axis. i suppose "inversion" is a better word here - the Z-axis is inverted. in the real world, your Z-axis points from you into the mirror. in the mirror image, the Z-axis points from the mirror, towards you. the other two axes aren't changed. Cleek | Image Toolkits | Thumbnail maker -- modified at 12:13 Monday 26th December, 2005
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Ramanan Sivan wrote:
Your axis of symmetry is because your eyes are placed left to right isn't it ?
No, your eyes are a small part, but not the deterining feature of your axis of symmetry. The whole "illusion" is caused by the fact that the light is reflected without rotation (or crossing left to right), but when you face another person, they rotate to face you, putting their left on your right. It has nothing to do with how your brain processes the information, but rather with the simple physics of reflection. It is your expectation of left and right that is wrong, not the refelction. You expect your reflection to have had to rotate to face you, but it does not. Absolute faith corrupts as absolutely as absolute power Eric Hoffer All that is necessary for the triumph of evil is that good men do nothing. Edmund Burke -- modified at 11:25 Monday 26th December, 2005
I think I get it now, the mirror reflects things that are put 'into it', 'out of it' "One of the Georges," said Psmith, "I forget which, once said that a certain number of hours' sleep a day--I cannot recall for the moment how many--made a man something, which for the time being has slipped my memory."
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I think I get it now, the mirror reflects things that are put 'into it', 'out of it' "One of the Georges," said Psmith, "I forget which, once said that a certain number of hours' sleep a day--I cannot recall for the moment how many--made a man something, which for the time being has slipped my memory."
Chris's explanation(s) below are better: the mirror inverts the z-axis, rather than rotating the Y or x axes. The beholder misinterprets the z-axis inversion as a y-axis rotatation. Absolute faith corrupts as absolutely as absolute power Eric Hoffer All that is necessary for the triumph of evil is that good men do nothing. Edmund Burke
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one of my friends who recently attended an interview of google, had a boot with the very first question. the question was Q>when you look into a mirror , your left becomes right and your right becomes left. but why your top doesn't become bottom(leg!) and bottom become top. wby this reverse look happens only for left-right thing?? A: :~ :doh: Quit! :( how about u?
"But your mind is very complex, very tricky. It makes simple things complicated. -- that's its work. And for centuries it has been trained for only one thing: to make things so complicated that your life becomes impossible."- Osho
--[V]--
VivekuniQ wrote:
when you look into a mirror , your left becomes right and your right becomes left.
To state this yet another way: no it doesn't. If you could actually duplicate yourself, and place that duplicate in front of you rotated 180°, you would find that its left is on your right, and its right is on your left. Not so the image in the mirror - left is reflected on the left, right on the right, top on the top, etc. etc. But our brains are used to recognizing people with left-right symmetry, and so we assume that one seen facing us is rotated 180°. So (for instance) you reach with your right hand to shake the hand to the left of the person facing you. The image in the mirror is one of the few times you'll see a human without them being rotated - and so, we interpret this odd creature as some bizarre reversal.
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it's not a rotation around the Z-axis, it's a rotation of the Z-axis. i suppose "inversion" is a better word here - the Z-axis is inverted. in the real world, your Z-axis points from you into the mirror. in the mirror image, the Z-axis points from the mirror, towards you. the other two axes aren't changed. Cleek | Image Toolkits | Thumbnail maker -- modified at 12:13 Monday 26th December, 2005
Chris Losinger wrote:
it's not a rotation around the Z-axis, it's a rotation of the Z-axis
Nicely put "One of the Georges," said Psmith, "I forget which, once said that a certain number of hours' sleep a day--I cannot recall for the moment how many--made a man something, which for the time being has slipped my memory."
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one of my friends who recently attended an interview of google, had a boot with the very first question. the question was Q>when you look into a mirror , your left becomes right and your right becomes left. but why your top doesn't become bottom(leg!) and bottom become top. wby this reverse look happens only for left-right thing?? A: :~ :doh: Quit! :( how about u?
"But your mind is very complex, very tricky. It makes simple things complicated. -- that's its work. And for centuries it has been trained for only one thing: to make things so complicated that your life becomes impossible."- Osho
--[V]--
Another way of thinking about it, the inversion doesn't occur on an axis. It occurs in the plane of the mirror. Two inversions will produce a rotation about the axis of their intersection. We are used to things being rotated about the z-axis to get in a similar orientation, that's why they look reversed.
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Its because your eyes are placed horizontally, if your eyes were placed vertically when you stand in front of a mirror you should see everything inverted top to bottom. "One of the Georges," said Psmith, "I forget which, once said that a certain number of hours' sleep a day--I cannot recall for the moment how many--made a man something, which for the time being has slipped my memory."
So if you only have one good eye , do you appear as a thin line then?
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one of my friends who recently attended an interview of google, had a boot with the very first question. the question was Q>when you look into a mirror , your left becomes right and your right becomes left. but why your top doesn't become bottom(leg!) and bottom become top. wby this reverse look happens only for left-right thing?? A: :~ :doh: Quit! :( how about u?
"But your mind is very complex, very tricky. It makes simple things complicated. -- that's its work. And for centuries it has been trained for only one thing: to make things so complicated that your life becomes impossible."- Osho
--[V]--
So I guess Google just wants to hire good looking people, since those are probably the ones that spend enough time gazing into mirrors to ponder such things. Matt Gerrans
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So I guess Google just wants to hire good looking people, since those are probably the ones that spend enough time gazing into mirrors to ponder such things. Matt Gerrans
'Tricksy' interviewers like would just piss me off. I'd rather have someone play "20 Stupid Code Tricks" with me. I've never had a real interview work that way, fortunately.
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