Again an initial angle controls all the rest of the moving objects. This way the construction is very similar to the windmill animation.[br][br][b][color=#cc0000]HINT - [/color][/b][br][list][*]Construct the first cart using this tool [icon]/images/ggb/toolbar/mode_rigidpolygon.png[/icon][/*][*]Construct the next carts using this tool [icon]/images/ggb/toolbar/mode_translatebyvector.png[/icon][/*][*]You might be able to find a nice picture of a cart, which you can use instead of the polygon.[/*][/list]