Here's  'The dogs' debate'. A simple single axle passes through the case, but a surprisingly complex sequence of actions is achieved by the use of four cams, which control the mouth movements and barking of the two dogs. In response to popular demand the instructions for this kit have many diagrams to make assembly as easy as possible. The movie includes some silly shadows.  We couldn't resist the temptation!  You can buy 'the dogs' debate' kit on our shopping cart page here