Contemporary reception of colonial monuments in Australia is informed by global debate on race, memory and representation in public space, typified in the decolonial and anti-racist movements Rhodes Must Fall and Black Lives Matter. While art historians and anti-colonial iconoclasts alike easily conceive of statues as objects for critique, non-figurative sculpture is no less effective when deployed as an ideological tool. Given the typically progressive politics of twentieth-century abstractionists, this study asks how comfortable these artists are with the nation-building function often ascribed to their work by political elites. Through a thematic survey of the commemorative landscape of Newcastle, NSW, this article describes a city punctuated by patriotic references to war, colonialism, and Indigenous absence, exemplified in modernist sculptor Margel Hinder’s (1906–1995) *Civic Park Fountain* (1966). Recounting its relaunch in 1970 as a memorial to Captain James Cook and its vandalism in 2020, the article examines changes in public reception of the fountain, from hostility towards abstract art and government spending to outrage at colonial symbols. Archival reconstruction of Hinder’s responses to local government demonstrates her silence on the fountain’s assimilation to colonial celebration. When contrasted with Hinder’s activities as a lobbyist and camouflage designer, this finding reveals a complex political biography. Without ignoring Hinder’s concern for Aboriginal rights, her attitude towards the instrumentalisation of her work is at best ambivalent. Beyond challenging the apolitical readings of Hinder’s work in existing scholarship, this study provides a key example of the ideological malleability of abstract public art. By producing “empty” signifiers to then “fill” with meaning, abstract sculptors and administrators together help to shape the semiotic and racial topography of urban space.