# Systems Theory Notes
 
 Processing feedback in dynamic systems.
 
 In a dynamic system or simulation, variables inform the procession of model states as the variables themselves develop. If the volume of an expanding object has an inverse correlation with its growth rate, the growth rate slows as the object grows.
 
 Macro-organs like blood vessels seem simple compared to their micro-counterparts. On small scales, chemical reactions destroy, alter and create themselves constantly. The behavior of macro organs is the effect of this unseen behavior.
 
 A fluid transportation system has two aspects: its purpose and its health. In biology, it is not really possible to determine the purpose of a strategy outside the context of the maintenance of the things which are doing things.
 
 Entity-hood is a discernible quality of systems and things: a cell and a cell wall, a walled city and the land around it.
 
 Defining the behavior of a simulated dynamical system requires partitioning information commensurate with what the system should clarify. To be effective, a model must predict the summation of behavior at a smaller scale. If the behavior of groups of actors is predictable, a model can be made ("emergent behavior").
 
 Tissue growth relies on principles which yield observable results, without necessarily reproducing the actual chemical dynamics. Cells multiply and are arranged to form tissue. The substance of tissue is a product of a metabolism, which is a system not unlike an aqueduct.