It may be considered contradictory that reproduction, a process that involves continuous time-dependent chemical change, is paralleled to an attractor, a term that signifies a stationary state. However, upon graded assembly growth, the joining molecules would exert only small perturbations on the compositional steady state, which would be easily corrected by the attractor dynamics (Figure ). Such compositional preservation, defined as homeostatic growth ( ) is a key underpinning of assembly reproduction . This rationalizes the relationship demonstrated here between self-reproduction capacity and compositional attractor state.