SEP

An SEP is something we can't see, or don't see, or our brain doesn't let us see, because we think that it's somebody else's problem.... The brain just edits it out, it's like a blind spot. If you look at it directly you won't see it unless you know precisely what it is. Your only hope is to catch it by surprise out of the corner of your eye.

The technology involved in making something properly invisible is so mind-bogglingly complex that 999,999,999 times out of a billion it's simpler just to take the thing away and hide it....... The "Somebody Else's Problem field" is much simpler, more effective, and "can be run for over a hundred years on a 9Volt battery."

This is because it relies on people's natural predisposition not to see anything they don't want to, weren't expecting, or can't explain.

In this case, the Starship Bistromath ("a small upended Italian bistro" with "guidance fins, rocket engines and escape hatches") has been hidden from the crowd watching a Cricket match at Lord's by an SEP field. People may see it, but they take absolutely no notice of it.

The book says that the SEP field is derived from Bistromathics and in particular the concept of an imaginary number called a "recipriversexcluson" whose existence can only be defined as being anything other than itself. Modern science has been slow to investigate this further, though Professor John Wettlaufer (of Yale University) has apparently observed that it is very important for physicists working outside the mainstream "to have a genuine interest in learning about someone else's problem". However, he admitted that "not many people want to do this".

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