Abstract: In the simulation of a spatially-extended physical process the complete spatial extent of which is defined by a multiplicity of parameters, each parameter is represented with a multi-state distinguished sequential digital logic circuit the possible states of which represent the possible states of the pertaining parameter. The interaction of each pair of parameters is represented with an interconnection between the pertaining circuits. Each logic circuit is initially established in a known state and thereafter at least one circuit is pulsed to cause evolution of the circuits through some or all of their possible states. The states of certain circuits are determined intermittently as a measure of the corresponding states of the parameters.