More informations about the KO * OP artists:

visual works of Peter Kastner

audio works of Peter Kastner

Paolo Moretto

Some theory:

Marx, Engels & company: german - english - italian

Some more interesting artists & artworks:

Jan van Wissen - Rodney Dickson - Shojo no Tomo - Barbara Pier - Walter Puppo - Luciano Sansone - Diego Rivera - Giuseppe Pellizza da Volpedo