I came across this slim collection in one of Sheffield's hundreds of charity/second-hand shops. Not normally in my line, being first published in 1962, with some of the stories dating back ten years before that--and boy, does it show in the writing--but I first encountered the title story in one of those "Best SF Ever" collections back in the late 80's, and though I'd forgotten who wrote the thing, I still remembered much of the story itself. So... Mr Cogswell... entertain me?
The oldest story, The Specter General, is the ropiest, too long to effectively carry the gimmick. Of the others, all but The Wall Around the World itself are single-joke shaggy-dog stories. However I recognise that a lot of my own short stories also fall into this category, so I can't hold it against Cogswell. The narratives are hellishly dated though, with nearly all of the male characters speaking in the same jokey, colloquial tones. The female characters... well, at least there are female characters in some of these stories, but in two of them they are there only as buxom secretarial relief. It doesn't get very much better than that.
So we come to The Wall Around the World itself. After the rest of this collection, the passion and belief in Porgie's character stands out a mile, and Cogswell runs with it. It's the most well-developed of his worlds (and that only lightly) and anybody who reads it today will struggle to avoid comparisons with a certain bespectacled boy wizard, but plainly Cogswell covered this ground first and it's no surprise that this was the work that later got anthologised ahead of the others in this collection. Still a shaggy-dog story, especially with the final pay-off line, but the best of the lot.