This chapter seeks to relate the toolmarks observable on sculpted objects to the ways of making and understanding that sustained ancient marble carving as a generative strand of cultural production. The discussion concentrates on the carved lines and planes that came to constitute Athenian stelai as standard material supports for inscribed texts, sculpted figurations, or combinations thereof. It begins by highlighting the contradiction between human creativity and material determinism in previous literature on Greek sculpture and the opportunities that enactive notions of knowledge present for evaluating ancient craft in cross-disciplinary debates about human technicity. The two subsequent sections examine how grooves were carved into planes and what this procedure might reveal about the epistemic affordances of linear marks. The conclusion connects the finished carvings with their origin in quarry-bedded marble blocks to bring out the broader arc of cultural knowledge involved in accommodating natural fissures in stone into the spatial projections of Athens’ evolving monumental landscapes. The exploration was made possible through collaborative replication experiments with a contemporary stone carver, which aimed to foreground lines and planes as mutually dependent phenomena, creating varying ontological conditions for telling things with stone.