19 Feb '09 20:27>
People say that mirrors flip left-to-right but not upside down.
I believe that we perceive the flip to be left to right, because when we look at any object in a mirror, for example, ourselves, we mentally rotate the object in the mirror 180 degrees, about a vertical axis, because that is how we rotate in real life. We then compare this rotated image to ourselves, and find that it is flipped left-to-right.
What if we mentally rotated the image about a horizontal axis? when we compare this rotated image to ourselves we find that it is exactly they same, but upsided down.
I think that it is wrong to say that mirrors flip left-to-right but not upside down, i think they are the same thing, it just depends on how you see it. Humans are mentally geared to see it as left-right reflection for some reason or another, that's all.
I believe that we perceive the flip to be left to right, because when we look at any object in a mirror, for example, ourselves, we mentally rotate the object in the mirror 180 degrees, about a vertical axis, because that is how we rotate in real life. We then compare this rotated image to ourselves, and find that it is flipped left-to-right.
What if we mentally rotated the image about a horizontal axis? when we compare this rotated image to ourselves we find that it is exactly they same, but upsided down.
I think that it is wrong to say that mirrors flip left-to-right but not upside down, i think they are the same thing, it just depends on how you see it. Humans are mentally geared to see it as left-right reflection for some reason or another, that's all.