Back before all-digital music, back before the Digital Compact Cassette, back before even the Digital Audio Tape existed, there was a strange audio device that briefly captured the imagination of Hi-Fi freaks across the world. The Elcaset, as it was called, was an enlarged cassette that started in Japan, wove its hidden, spinning spools around the world, and then finished, appropriately enough, in Finland.
As someone who swore by MiniDisc up until quite recently, I love obscure audio formats. This article is from the summer of last year, but I only came across it just now thanks to Atlas Obscura.
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