A precise and meditative composition by Josef Albers, *I-S a* exemplifies his lifelong investigation into the optical and psychological effects of color interaction. Through the screenprint medium, Albers layers flat, geometric forms with characteristic clarity, allowing hues to shift and vibrate against one another in ways that challenge perception. Printed in colors on German Etching paper with full margins, the work reflects his rigorous, systematic approach to understanding how color is never seen in isolation but always transformed by its surroundings.