Cover ornamented with rubber stamp in black ink: sender's return address. Rubber stamp in purple ink: "PRINTED MATTER". US letter sheet enclosed. List of contributors to Brain Cell ~ 43. A3 sheet enclosed. Issue No.43 of Brain Cell. Sheet covered in various rubber stamps and artist stamps in various colors. Notable contributors: Guglielme A. Cavellini, Ryosuke Cohen, Klaus Groh, Mogens Otto Nielsen, Private World. Small sheet enclosed. Request for materials for the Brain Cell project.