A dynamic interplay of light and shadow is created through Mack's use of textured aluminium mounted on painted wood, producing a shimmering, rain-like visual effect across the surface. The rhythmic patterns of the metal capture and reflect ambient light, evoking the fleeting, ephemeral quality of falling rain. This work exemplifies Mack's exploration of light as a primary artistic medium, central to the ZERO movement's pursuit of pure visual sensation.