Taking recent ethnomethodological insights into gender as an ongoing intera
ctional accomplishment as a starting point, a research group conducted an e
thnographic exploration of the practices of gender differentiation among ni
ne- to twelve-year-old schoolchildren in Germany. This article deals with a
small segment of these practices: spontaneous territorial games, character
ized by a high degree of physical activity in which the children split up i
nto gender-homogeneous teams. Based on the detailed analysis of two recess
situations, the article explores how gender-defined territories are achieve
d interactionally and how gender polarity is thus staged. The concluding pl
ay-theoretical reflections in particular show that territorial games simpli
fy, alienate, and aestheticize gender arrangements.