In 1971, Françoise Sullivan took part in the famous exhibition 45° 30’ N – 73° 36’ W, considered to be the root of conceptual art in Montreal. Sullivan recounts that when she visited the Sir George Williams Gallery to think about a concept, her attention was drawn to a pillar, and immediately an idea germinated in her mind. It consisted of notating on the pillar’s four faces the heights of her four sons at various stages of their growth, accompanied by a photographic portrait of each. The work, which exemplifies the close relationship Sullivan has always maintained between her activity as an artist and her personal life, was exhibited on that occasion only. The portraits of her sons were found in the artist’s archive along with two handwritten charts that are in all likelihood those used to transcribe the data onto the pillar in the Sir George Williams Gallery.