Claustrophobic Notebook

I love this.

By Maison Martin Margiela so you know it's 2 kewl 4 skool.

From the website:

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Notebook bounded by two spirals that prevent its opening.

To release the pages and use them, one must rip one side of the cover and so on for each page. 

Comes in two sizes: Small and Medium (sold separately).

Small: 4.1" x 3.7".

60 pages.

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From €16.

You ask, "How big is the Medium?"

Who knows?