Four Bar Variation: Four bars linked with four parts of connection, 2 sationary.  By driving line ab to rotate around point a “a rathering intriguing motion” occurs. Designed by john bryant and chris sangwin (how round is your circle”) Analysis: The four bars were recreated however the proper angles could not be determined.  The outcome was a rotating parallelagram. Execution: A parametric circle was added to this mechanism.  The diameter of the circle chages with the rotation on point e. Grasshopper Definitions: Iteration 1: Iteration 2: Iteration 3: Iteration 4: Iteration 5: