Friday, April 10, 2009

Lessons from a hologram

Holography is a technique that allows light scattered from an object to be recorded and reconstructed later so that it appears as if the object is in the same position relative to the recording medium as it was at the time of recording the image. As the position and orientation of the viewing system changes,  the image changes  in the exact same way as if the real object is present and thus  we get a three dimensional image.  We don't have to look far to see a holographic image. It is present in our credit cards and driver's licenses. 

An interesting property of hologram is that its entirety can be reconstructed from arbitarily small part.  That is, if we tear a hologram into half, each half will still show the image as a whole. This is true even if we keep on cutting them to smaller and smaller pieces. Each tiny fragments will still contain the information necessary to make another but smaller version of the original image. Every part of the hologram contains all the information possessed by the whole. 

If we try to take apart something constructed holographically,  like say dissect it to study its respective parts, it simply is not possible - all we get by that process is smaller wholes (quantum entanglement?). I think in reality that there are no pieces that make up a whole because nothing exists that in not comprehensive by itself.  I guess each one of us harbors a universe within ourselves just like the universe harbors us. 

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