This model simulates the emergence of innovation in a discovery space. Innovation is conceptualized as a “concatenation” of individual discoveries, where discoveries sites (which may be known or unknown) are distributed around a 2D discovery space. It shows that innovation depends critically on the density of individual discoveries, as well as their connectivity. This is an example of a common feature of complex systems: the presence of a non-linear threshold or critical parameter (i.e.: a tipping point). The model is conceptually equivalent to percolation (ex: like rainwater percolating through the ground).