Much as Murphy (1938) insists that desire is a ‘closed system’ in which ‘the quantum of wantum does not vary’, the Knott household in Watt (1953) seems to be a closed system ‘to which nothing could be added’ and from which ‘nothing could be taken away’ (Mu, 38–9, Wa, 111). Yet the random variable of Knott's appetite produces an instability that must be corrected to maintain equilibrium. This essay argues that Watt's efforts to dispose of Knott's leftover food work through a problem of equilibrium with consequences for Beckett's ideal of compositional practice. In October 1932, Beckett says to Thomas MacGreevy that writing should be a ‘spontaneous combustion of the spirit to compensate the pus & pain that threatens its economy’ (LSB 1, 134–5...