The teacher in this vignette has an orientation toward students’ mathematical ideas. She invites students to share these ideas, listens carefully as students offer explanations, and then asks follow-up questions to support students in adding greater specificity and detail to these explanations. Her questions also imply an expectation that students will attend to the details of one another’s mathematical ideas. Such an expectation is developed through intentional work to build a classroom community in which students’ ideas are valued and heard by all.