This beautifully metaphorical sentence from Anne Carson's Autobiography of Red evokes a vivid interplay of natural elements and emotions. The imagery of a "paste of blue cloud" conveys a thick, almost tangible concentration of cloud formations — suggesting something dense and perhaps initially chaotic or overwhelming. The notion of this paste "untangling itself" indicates a process of transformation, emergence, or resolution. Against the backdrop of a "red sky over the harbour," the scene seems charged with vivid color and possibly portends a dramatic moment, be it a sunset or an emotionally intense atmosphere.

The phrase encourages deep contemplation about change and clarity. The clouds represent confusion or complexity, and untangling hints at understanding or calm emerging from disorder. Coupled with the red sky, which might symbolize passion, danger, or the closing of a day, the image becomes a stunning metaphor for moments when turmoil subsides to reveal new perspectives or truths.

Reading this in the context of Anne Carson's work, which often explores themes of identity, transformation, and the blending of myth with contemporary life, further enriches its significance. The harbour setting also invokes ideas of transition, a juncture between land and sea where journeys begin and end. Overall, this small slice of poetic language invites readers to meditate on the natural rhythms of change both in the external world and within the psyche, making the ordinary act of clouds moving across the sky into a reflection on personal unraveling and redefinition.