Walking on Thin Ice (Blue-Black Grey Red Pink Bar Combo) is a commanding cast urethane work that suspends color in a state of luminous tension, its stacked horizontal bands of blue-black, grey, red, and pink appearing to glow from within rather than simply reflect light. Measuring nearly two meters in height, the piece commands architectural presence while remaining intimately concerned with the phenomenology of perception, inviting viewers to consider how color shifts, breathes, and transforms depending on the angle of approach and the quality of ambient light. The combination of hues Alexander has chosen here is characteristically bold yet nuanced, the cooler tones pressing against the warmer registers in a relationship that feels simultaneously geological and atmospheric. Peter Alexander has worked with cast resin and urethane since the late 1960s, when he emerged as a central figure in the Light and Space movement alongside artists such as Robert Irwin and Larry Bell in Southern California. Decades on, his command of the medium has only deepened, and works like this one demonstrate his continued ability to coax from an industrial material a quality that is almost transcendent. The title carries a poetic charge that echoes through the visual experience, suggesting precariousness and beauty held in careful balance, much as the work itself holds its colors in a kind of arrested suspension. Signed by the artist and presented without a frame, the work is suited to collectors who appreciate the intersection of formal rigor and sensory immediacy. Its scale and material presence ensure that it reads with authority in both residential and institutional settings, and its 2020 date places it among Alexander's most recent explorations of the color bar format, a late-career body of work that has attracted significant critical and market attention through Pace Gallery.