Broad Mental Horizons

The kind that fans have – or at least claim to. First used to describe the mind set of fans by Margaret St. Clair in a 1948 article in Writer's Digest, it was quickly picked up and used tongue-in-cheek in numerous fanzines, where the catch phrase caught on to become firmly embedded in the fannish lexicon

Contributors: Dr. Gafia

from Fancyclopedia 2 ca. 1959
Something fans have, along with cosmic concepts, a sensitive fannish face, and sometimes slan tendrils or a third eye. One with any or all of these attributes is undoubtlessly star-begotten. Margaret St Clair credited us with this characteristic in an article in a '48 Writers' Digest.