Charles Fort once pointed out that in steam engine time people build steam engines. He was trying to explain the phenomena whereby people invented the same things at the same times in far-apart places, with no contact with each other, when the time was right. It's as good an explanation as any. (And if you don't know who Charles Fort is, or only know his name from the masthead of the Fortean Times, you can read the books that started it all here.) I suppose in Coraline time, people make Coralines. I'm just glad (and fortunate) I was first.