Dating from 2010, Summer Solstice is a significant example of Harold Cohen’s late collaborations with AARON. As the programme became increasingly focused on abstraction, Cohen resumed his role as a theorist, continuing to explore how line, shape, and colour interact within the pictorial field while remaining deeply grounded in the traditions of abstract art.

In this work, and others from the same period, Cohen employed code that emulated the structural logic of leaves and trees, with each form algorithmically “grown” through generative processes. During these years, he pushed AARON toward increasingly sophisticated spatial constructions and background environments, though the system could not yet fully realise the complexity he envisioned. Rather than allowing AARON to generate the entire composition autonomously, Cohen began painting the backgrounds himself, creating a renewed dialogue between hand and machine. In this way, Summer Solstice represents yet another mode of collaboration between the artist and the programme, reflecting the fluid and evolving nature of Cohen’s partnership with AARON in the final decade of his career.