In the days before music compression if you wanted to carry more music in less space you had to shrink the cassette itself.
A look at the rare Audio Craft CC-1 cassette. Released only in Japan.

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------THANKS TO ------
Jerobeam Fenderson for the intro animation: http://oscilloscopemusic.com/

---------Outro Music----------
Over Time - Vibe Tracks    • Over Time – Vibe Tracks (No Copyright...  

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---Extra Info----
I was unable to find out any more information about this product - so my assumption that it was from the 1980s was merely a guess...it just as well might be from the 1990s.

Teac O'Casse
Here's the video about the Teac O'Casse
   • TEAC O'Casse Open Cassette -  Reinven...  
Since I made that video I've been informed that I was pronouncing the name incorrectly. In Japanese it sounds more like 'o-kassehy'