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"One could imagine a very ascetic sort of life ... where the body is ignored. This is something I've played with in my books, where people hate to be reminded sometimes that they have bodies, they find it very slow and tedious."
- William Gibson

Ether-Wall  
  An invisibility field.  

This is the first reference that I know of to an invisibility field.

An ether-wall is an invisibility cloak; it ensures that you cannot be "seen" visually or by using any form of energy.

"...An ordinary ether-wall is opaque in one direction and doesn't bar matter - you are transparent both ways and something more than impenetrable to matter. How do you do it?"

You could not understand them if I explained them to you, and they are merely two of our smaller developments. I do not intend to destroy your planet Earth; I have no desire to rule over masses of futile and brainless men...

This structure is ... indetectable and invisible - ether waves are bent around it without loss or distortion."

From Triplanetary, by E.E. 'Doc' Smith.
Published by Not known in 1934
Additional resources -

Invisibility fields are now common in science fiction; this concept made some key appearances in both the classic Trek television show, and in the Star Trek movies, for example.

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