La Perruque is a 1 × 90 cm-long magazine publishing nonstandard type specimens printed in the unused margins of offset printing paper sheets.

http://la-perruque.org

“A ‘homer’ [«perruque» in french] is an artifact that a worker produces using company tools and materials outside normal production plans but at the workplace and during workhours. Despite legal, artistic and ethnographic evidence of their existence, silence surrounds [perruques]. […] this silence is not linked just to the marginal and illegal quality of these artifacts. [Perruques] shed light on a high degree of ‘complicity’ between employees regardless of their position in the hierarchy.”
(Michel Anteby, “Factory ‘homers’: Understanding a highly elusive, marginal, and illegal practice“)
http://la-perruque.org/about.html