Plot: Big thinks that Small is creating a mess all over the house and invents a machine which tidies away all of Small's debris. Small, shocked, tells Big that the pile of dirty socks Big has just sucked into his machine is actually a scientific experiment and that the old red jelly lid is a model of the planet Mars! Small decides to walk away and find some place else to live in - and discovers, through a mouse hole, a neat little room where he builds a fort from a sofa and bounces on the bed