Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsGrowth in 1D Substitution Systems with Two Colors and Up to One Neighborhttp://demonstrations.wolfram.com/GrowthIn1DSubstitutionSystemsWithTwoColorsAndUpToOneNeighbor/]]>http://demonstrations.wolfram.com/GrowthIn1DSubstitutionSystemsWithTwoColorsAndUpToOneNeighbor/