Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsPeaucellier's and Hart's Inversorhttp://demonstrations.wolfram.com/PeaucelliersAndHartsInversor/]]>http://demonstrations.wolfram.com/PeaucelliersAndHartsInversor/A Polygon That Folds into a Regular Tetrahedron or into a Rectangular Boxhttp://demonstrations.wolfram.com/APolygonThatFoldsIntoARegularTetrahedronOrIntoARectangularBo/]]>http://demonstrations.wolfram.com/APolygonThatFoldsIntoARegularTetrahedronOrIntoARectangularBo/Kempe's Angle Adderhttp://demonstrations.wolfram.com/KempesAngleAdder/]]>http://demonstrations.wolfram.com/KempesAngleAdder/