A quintessential example of François Morellet's rigorous Op Art and Concrete Art practice, this unique 1973 work comprises four square panels joined together, each surface animated by evenly spaced diagonal black stripes at 45 degrees on a white ground. The 'coupée, décalée' (cut and offset) principle introduces a subtle optical interruption at the panel joins, creating a quietly destabilizing perceptual effect characteristic of Morellet's systematic approach. Signed, titled, dated, and annotated with an archive number, calculation, and sketch on the reverse, this work carries exceptional documentary integrity. It is offered with a Certificate of Authenticity issued by The Mayor Gallery.