In the 1980s, Nobuo Sekine launched the Phase Conception painting series, which captured the essence of Mono-ha. These later works, created with handmade paper, gold leaf, and industrial materials, emphasize his enduring interest in temporality, spatiality, and materiality. “Phase Conception: Spring Sea” exemplifies this concept through a wall installation while preserving the conceptual depth of his earthworks. It ranks among the largest pieces in his Phase Conception series. The title signifies a transitional season marked by awakening, fluidity, and atmospheric change. The surface appears shimmering, absorbing, and emitting—evoking a sense of vitality, responsiveness, and instability.