close together. Look at what happens when the two sets

-you get a new wave! When a crest and a trough

the water goes flat. When two crests

crest. When two troughs collide, they make a single, deeper trough.

just found a key to understanding how a

do waves in a pond have to do with those

amazing three-dimensional pictures? How do waves make a hologram look

It all starts with light. Without it,

much like the ripples in a pond, light travels in

you look at, say, an apple, what you really see are the

light reflected from it. Your two eyes each see a slightly

different view of the apple. These different views tell you

apple's depth -its form and where it sits in relation

Your brain processes this information so that

rest of the world, in 3-D. You can look around objects, too -if the

an orange behind it, you can just move

laser light waves are uniform and in step. When two laser beams

little more than a fascinating idea

One calculation holds that by using holograms, the U. S. Library of

"Normal" white light from the sun or a lightbulb is a

is a mass of dark and light swirls-it doesn't

between city skyscrapers and since they can bend

through your car windows to bake you

Some common words found in the essay are:
Holograms Toss, Laurence Olivier, Dennis Gabor, Library Congress, Prize He's, Isaac Asimov, light waves, reference beam, object beam, waves light reflected, bend light, waves light, light reflected, photograph can't, wave pattern, 3-d images, photographic film,
Approximate Word count = 994
Approximate Pages = 4 (250 words per page double spaced)