Franco Costalonga's *Col. Primari, Traslazione di un disco, Velocità diverse* from 1971 presents a captivating study in optical illusion and vibrant color. Against a luminous turquoise background, a sinuous, tube-like form coils across the composition, rendered in an electrifying combination of neon pink and chartreuse yellow. This dynamic structure is meticulously constructed from countless overlapping circular elements, each precisely cut and arranged in collage. The interplay of these high-contrast hues and repeating forms creates a powerful sense of undulating movement, as if a single disc is undergoing a continuous transformation, its perceived speed and dimension shifting before the viewer's eyes. The artist's precise hand and keen understanding of visual perception are evident in the seamless progression and spatial ambiguity of the central motif, inviting prolonged engagement. This work stands as an exemplary piece within Costalonga's significant contributions to the Op Art and Kinetic Art movements, where the exploration of visual phenomena and perceived motion was paramount. The title, "Primary Colors, Translation of a disk, Different speeds," directly informs the viewer's experience, highlighting the artist's rigorous investigation into how simple geometric units, when manipulated through repetition and chromatic contrast, can evoke complex sensations of depth, rhythm, and temporality. Costalonga masterfully employs the inherent properties of color and form to challenge optical stability, creating an artwork that is both intellectually stimulating and viscerally engaging. His use of collage, a technique demanding extreme precision, underscores the controlled execution necessary to achieve such a fluid and mesmerizing visual effect, making this an iconic representation of his distinctive artistic vision.