How can someone achieve invisibility?

[russ_watters]

That's been done. It requires a camera and a projector, and it really isn't all that useful.

http://www.cnn.com/2003/TECH/02/07/japan.invisible.ap/

 

[banerjeerupak]

well i have a completely different say on this topic. some of you may even like.
as per my knowledge, the vision is possible because something is either giving out light or is reflecting it to some extent.
hence the key to produce an invisibility cloak is to make a material which is completely absortive and does not reflect light to any extent.
obviously, this being an ideal case is not possible but a nearby state may be achieved

 

[Chaos' lil bro Order]

baner

If something absorbs all light it appears black so you wouldn't be invisible but you'd look like a silouette of coal

 

[soul_hunter]

what would happen if one's cells (i mean his or her body), become less denser than the surrounding of him or her? can't her/she go
"_" INVISIBLE "_"

 

[Rade]

Is it possible that the invisible results from a quantum superposition between asymmetrical fundamental particles ? What is "observed" thus depends on how much energy observer puts into the system to break the superposition ?

 

[dav2008]

what would happen if one's cells (i mean his or her body), become less denser than the surrounding of him or her? can't her/she go
"_" INVISIBLE "_"

If your body becomes less dense than air then you're going to have a hard time living.

 

[banerjeerupak]

my mistake

of course i admit that what i said was theoretically wrong.

after me there was a post saying that if we get less dense than air.
that would mean we would float upwards and not get invisible.
but we may argue that if our refractive index is made to be equal to that of air, we would be transparent and so would become invisible.
but the same question crops up that how do we do it.

 

[Farsight]

How about if the guy was shifted slightly forward in time?

 

[thoms2543]

light reflected by the man do not enter your eyes thus become invesible.but how to do?

 

[Danger]

Hmmm... I lost track of this thread for quite a while. Chaos, that's a fascinating approach. Similar in some regards to a chameleon. Definitely worth further investigation.

Just think of a woman's breast and her back, clearly the INPUT 180 degrees from her breast would not correspond to the correct mimicry of her OUTPUT on her breast, since her breast is curved and her back flat.

Well, in the case of my ex-, you've got that backwards.

 

[inviichix]

Switch Of The Light! Ha!ha!

Turning off the light doesn't make you invisible, just blind.

 

[scott1]

I like fantasy better than sci-fi; I'll stick to magical solutions to this problem.

This is a physics fourm.
I rember I saw somthing on the history channel(yes I know the history channel probally isn't good source of info about physics) that some physicst was working on this plasma shield thing could make you hader to see. It's even possible for it to work as force field at the same time.

 

[Alexander Demets]

I didnt read the hole thread and hope the recently published idea by John Pendry wasn't mentioned already.
A link to a BBC-Article:
http://news.bbc.co.uk/2/hi/science/nature/4968338.stm

I read a more technical article the first time, but unfortunatly I can't remeber the URL. U surely will get results by consulting google.

IDEA:
Producing a material which (now a analogy) behaves like a wooden stock in water, just with light and magnetic fields, etc.

I pretty like the idea and if those guys are able to produce such a material sooner or latter, they will really change our world!

 

[tardis]

Take a look at
http://sify.com/news/fullstory.php?id=14214715
http://english.people.com.cn/200605/29/eng20060529_269286.html
Currently on news sites - the promise of invisibility lurks just out of reach..

 

[Tzemach]

How about if the guy was shifted slightly forward in time?

I like that idea, you wouldn't see him because he is no longer there for the light waves to strike, but what if he stands still for a few minutes? Would we see him even though he was experiencing a different time frame, because doesn't that happen when we see a massive object? It is experiencing time at a different rate but is still visible.

 

[Chaos' lil bro Order]

@danger

I appreciate your comment.

I really think that the idea I presented is possible, if not extremely difficult to implement. Opsin proteins would likely be the best solution to making an 'intrinsic' invisibility function in the human body. I sure am curious as to how chameleons moderate their color changes, if you have a good link or article on this, I'd love to hear from you.

Thanks.

P.S. lol at your ex-wife's chest.

 

[Chaos' lil bro Order]

Anyone know the science behind chameleons?

 

[Rade]

Anyone know the science behind chameleons?

They change color of pigment chemicals in skin to blend into their environment--thus a form of being invisible--see this link:http://www.thecomdaily.com/Ch---Cl/Chameleon.php

 

[taylaron]

easy way.

ok, this is based off of the sci-fiction series called Artemis Fowl.

in the book these creatures use a certain vibration which the humans can't see. in otherwords, making the molecules in your body vibrate at a frequency that the human eye naturally can't see.
of course there are many many ways to get around this but. keeping with this idea, any thoughts?
i know that things going at a sertain speed, can't be seen by the human eye.
the only poblem its, it would have to be going back and forth as to not go straight. when you "stop" at the end of your vibration, you slow down in order to go the exact opposite direction. making you visible. slightly
is there anything that could make you vibrate at different frequency?
or am i just crazy?
VIBRATION PEOPLE!

 

[taylaron]

or prehaps "bending light" around something. of course you wouldent be able to see since you are on thie "inside" of this occurance.
but what about einstines theory: if you bend light, your bending space and time as well.

huh? obviously i don't know everything

 

[student85]

By running...a lot! a lot lot lot! Your inertia will increase!

You'll become a black hole! BAM, light can't escape you!

 

[Chaos' lil bro Order]

ok, this is based off of the sci-fiction series called Artemis Fowl.

in the book these creatures use a certain vibration which the humans can't see. in otherwords, making the molecules in your body vibrate at a frequency that the human eye naturally can't see.
of course there are many many ways to get around this but. keeping with this idea, any thoughts?
i know that things going at a sertain speed, can't be seen by the human eye.
the only poblem its, it would have to be going back and forth as to not go straight. when you "stop" at the end of your vibration, you slow down in order to go the exact opposite direction. making you visible. slightly
is there anything that could make you vibrate at different frequency?
or am i just crazy?



VIBRATION PEOPLE!

Well you aren't crazy. That author's ideas is though. It sounds good that's for sure, but what does he mean exactly? Your molecules are vibrating right now as we speak and I can still see you. If the US treasury had a nickel for everytime that I've heard terms vibration, frequency and harmonics used out of context to explain time travel or invisibility, the US would be out of debt.

I think the idea if I am understanding it correctly, is like waving your hand very quickly in front of your face so that it appears somewhat invisible. But as you pointed out yourself, at either ends of the vibration your hand must slow down to change direction and it then becomes very visible.

 

[rasgar]

The reason people generally want to turn invisible is either to mask your presence or to mask your location. For masking your location the "turning off the lights" proposal actually works. You could generate some photonic vacuum that makes a large area dark enough to give you that tactical advantage, while using sonar to see (although that can also be blocked by changing or removing the sound medium)

 

[ChemGuy]

I say the best way to do it is by moving a person to a different dimension. Heck string theory has a bunch left over. If you move a person there they would still be around but would be invisible in our 4 dimensions!

Wait maybe you could shift someone in time by a microsecond. They would be out of phase and thus be invisible!

 

[Chaos' lil bro Order]

Somebody lock this quick!