Agency and its role in the early literacy classroom has long been a topic for debate. While sociocultural accounts often portray the child as a cultural agent who negotiates their own participation in classroom culture and literacy learning, more recent framings draw attention from the individual subject, instead seeing agency as dispersed across people and materials. In this article, I draw on my experiences of following children as they followed their interests in an early literacy classroom, drawing on the concepts of "assemblage" and "people yet to come," as defined by Deleuze and Guattari and Spinoza's "common notion." I provide one illustrative account of moment-by-moment activity and suggest that in education settings it is useful to see activity as a direct and ongoing interplay of three dimensions: children's moving bodies; the classroom; and its materials. I propose that children's ongoing movements create possibilities for 'doing' and 'being' that flow across and between children. I argue that thinking with assemblages can draw attention to both the potentiality and the power dynamics inherent in the ongoing present and also counter preconceived notions of individual child agency and linear trajectories of literacy development, and the inequalities that these concepts can perpetuate within early education settings.