[FOSDEM] Paper in floor

[Walery ;o)]

Hello!

@FOSDEM in the floor you can find grey paper where everybody can draw.
I found this Photo:

http://www.vuntz.net/photoblog/20070228_FOSDEM-notes-bad.jpg

there you can see this grey paper.

Can somebody tell what is the name of this paper?
I would like to buy, but can't find it...

thx
Walery ;o)

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