How To Bounce Your Cat : Click on the wheels to change them. Press SPACEBAR to operate the hydraulics. Press the LEFT and RIGHT arrow keys to change which end of the car's hydraulics are activated. This project works by using a variable to determine which side of the car is going to move. When space bar is pressed, the car sprite is changed accordingly. A message is then broadcast to the CAT sprite to move to the appropriate location and make it look smooth. When the wheels are clicked, they change their costume and send a message to the cat. The cat changes its costume at the same time and also says something, depending on which costume it is.