A dynamic kinetic relief sculpture by Yvaral, son of Victor Vasarely, *Interférence B* combines screenprinted white geometric forms on a painted black wooden panel with three-dimensional metal tube and elasticated string elements. The work exemplifies Yvaral's exploration of Op Art principles, generating optical vibration and the illusion of movement through the tension between the flat printed surface and the physical sculptural components. As the viewer shifts perspective, the interplay of line, depth, and light creates a shimmering interference pattern that blurs the boundary between painting and sculpture.