This is a work of early computer art made by Frieder Nake. Its algorithm was run on a Telefunken TR-4 computer and the output was drawn with a Zuse Graphomat Z 64 .
Other works from this series where shown at “Tendencies 4, Computer and visual research” in Zagreb 1969 .
 See Peter Weibel and Margit Rosen, eds., bit international. [Nove] tendencije. Computer und visuelle Forschung. Zagreb 1961-1973. ZKM | Zentrum für Kunst und Medientechnologie Karlsruhe, 2007.