Components Used: 2 Motors (1 for movement and 1 for possible add-ons) 2 Touch Sensors Required Parts: RIS 1.0 Strong string to hang it on Description: Moves from one end of the string to another. When it gets there, the touch sensor hits the wall, (Or whatever is used to hang it) and it reverses directions. Instructions: Instructions are in Aerial.pdf. Aerial.pdf is (c) 2000 The LEGO Group (This is an independent site not authorized or sponsored by the LEGO Group.)