Op Art and kinetic art follow a parallel way. The motion can be expressed by means of different methods. It is either a simple, physical effect (the work relays on visual perception), either it is real and autonomous or due to a manipulation by the spectator. In kinetic art, the work and/or the spectator can move. In Op Art, on the contrary, the motion is purely optical, not real.
(Danielle Everarts de Velp-Seynaeve, 1997)

N° C.R. 1108, Twisted Strings, 1975, 60x60 cm
N° C.R. 1037, Torsions, 1973, 60x60 cm
N° C.R. 871 bis, Torsions, (1970), 65x65 cm