"Brain Cell is a mail art project begun by Ryosuke Cohen in June 1985. The project is a networked art project where individual artists contribute stamps, stickers, drawings or other images. These are sent through the mail to Cohen, who assembles and prints them as part of each cell. He prints 150 copies (30 x 42 cm) with a small silkscreen system called a Cyclostyle (now out of production). Each participant is mailed a Brain Cell print along with a documentation list of contributors world wide.
Cohen keeps a copy for himself. Some of the remaining Brain Cells
prints from each edition are assembled into sets of 30 consecutive
editions. These set are sent to artists and Mail Art shows around the
Cohen also uses Brain Cells prints in the Fractal Portrait Project
(another long running art series by Cohen) and as additions to Mail Art
Add and Pass pages.
New Brain Cell editions are published every 8 to 10 days. As of December 31, 2012, there have been 847 issues.
Cohen described the origin of the project's name in 1985: :) "Well,
I’ll title my work “Brain Cell”, because the structure of a brain
through a microscope looks like the diagram of the Mail Art network.
Thousands of Neurons clung and piled up together are just like the Mail
Art network, I believe."
Brain Cell is an art experiment in the vein of networked mail art,
where a network expands from A, copied, forwarded and even returned to
the originator. This produces a series of cybernetic cells, which can
interact in a non-linear order. Brain Cell has enlisted over 6,000
contributors from 80 nations since 1985.".
Here is instead the official webpage of the Japanese mail artist Ryosuke Cohen where you`ll find his biography and the other projects he still runs.
This is the famous invitation to take part to his Brain Cell mail art project.
There are lots of other info on the net about him,so you will easily find more webpages dedicated to his work.As far as I know this mail art project is still running,GREAT :)