Somebody Else's Problem field
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The Somebody Else's Problem field (SEP field) is a fictional technology from The Hitchhiker's Guide to the Galaxy "trilogy" by Douglas Adams. It is a cheaper and more practical alternative to an invisibility field.
An SEP field can be erected on, or projected around a bizarre and unbelievable scene so that the unconscious minds of the observers instantly abdicate responsibility for its existence, assert that it's "somebody else's problem", and therefore don't perceive it at all. The primary example of this was given in the third book Life, the Universe and Everything, when a UFO (a spaceship powered by the Bistromathic drive owned by the character Slartibartfast) landed in the middle of a cricket ground during a match, and the assembled crowd failed to notice it. Another prime example is when above ship's field is extended so that the characters fail to notice the fact that they cannot breathe or the fact that the asteroid that they are standing on does not have enough gravitational force to hold them down.
The SEP field requires much less energy than a normal invisibility field (a single flashlight battery can run it for over a hundred years) due to the natural propensity of humans to see things as Somebody Else's Problem. This is very close to the idea suggested by Terry Pratchett (who has often been compared to Douglas Adams) that people do not see whatever they are sure cannot be there (such as Death).