The Cat in the Hat Knows a Lot About That!

Nick and Sally need a strong piece of string to pull their train, but it breaks. The Cat takes them away, but the TMJ malfunctions and they have to make an unscheduled landing. / Nick and Sally notice a bird flying back and forth in the tree branches. The bird is building a nest and they want to get a closer look. The Cat takes them to a mirror world where they learn how reflections work.