Relative complexity and similarity of AND, OR, A, B, and XOR environments as a graph. Node values correspond to the environmental complexity (squares, border thickness is proportional to the complexity). Pair-wise similarity is calculated as the Pearson correlation of nutrient presence between environments and corresponds to the edge value (red and blue represent correlation and anti-correlation, respectively). The environment of highest complexity, XOR, is part of a cluster of strongly correlated environments (A, B, OR, and XOR). Environment AND is the simplest one, and it is isolated from other environments (low or negative correlation).