In 1994, Dutch mail artist Ruud Janssen began a series of mail-interviews, the body of which are now recognized[by whom?] as an influential contribution in the field of mail art. He interviewed Fluxus and mail art personalities by using all the communication-forms that were available (fax, e-mail, envelope, personal meeting, telephone). The question traveled by one form and the answer could be sent back in another form. This concept resulted in a series of mail-interviews. These interviews were published in booklet-form and the complete texts are also available online. In 2008, a selection of the mail-interviews were published in book form.