The Belgian ZERO artist Jef Verheyen (1932-1984) became known as the painter of light streams and colour spectra. He experimented not only with light, but also with movement and the invisible as means to evoke natural mechanisms and to reveal universal interrelationships between human beings and the surrounding world. He used geometric principles – his passion for geometry was born out of his interest in mathematics and (Greek) philosophy – as the basis for harmony. Verheyen never gave up on traditional media and materials such as the canvas, paint, and brushes to search for the essence of our nature. 

Jef Verheyen

678 Le Plein, 1967
Private
Sculpture , 65 x 41,5 x 7,5 cm
High-grade steel, polished

Verheyen conceived the counterpart 'Le plein' as being the opposite of the multiple 'Le vide' (102). However, 'Le plein' was only realised as protoype (65 x 41,5 x 7,5 cm). 
Both prototypes of 'Le vide' and 'Le plein' were exhibited during Verheyen's participation at the Biennial of Venice in 1970 (Belgian pavilion) and in the group exhibition La couleur seule, Musée Saint Pierre Art Contemporain Lyon in 1988.

References
  • Jef Verheyen - Met Boog en Pijl in de Vlakte / Frank Heirman. - Borgerhout : S&S Galerie, 2013. - niet-genummerd van 56 niet-genummerde exemplaren. -  : ill. ; 24 x 16.4 cm

  • Maurice Besset (ed.), La couleur seule. L'Experience du monochrome, exh. cat., Musée Saint Pierre Art Contemporain Lyon (07.10.1988 - 05.12.1988), Lyon: Octobre/Musée Saint Pierre, 1988. - ill., 32,2 x 25,2 cm