"Somebody Else's Problem", an effectively-magical field that obscures things you think aren't relevant to you, such that even though you see them (or hear them or read them) you
don't actually *notice*, and quickly forget.
More generally, the phenomenon that causes people to ignore issues that they know about but think of as either not
something they can do anything about, or not personally relevant to them right now. This can result in
something that's very important to a group of people being ignored by every individual member of that group.
Popularized by Douglas Adams in the "Hitchhikers Guide to the Galaxy" series, in which Ford Prefect describes it as:
"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."
In that series, a strange object can be effectively hidden from view while out in plain sight, by an "SEP field", which "relies on people's natural predisposition not to see anything they
don't want to, weren't expecting, or can't explain."
It's just been sitting there all day, hundreds of people have walked by, and
nobody said anything or even turned to look! It's like it's got an SEP field around it.