Little Robots: Knock, Knock

Stop-frame animation about Tiny and his Little Robot friends, who create their own world on a scrapheap. Sporty and Scary are confused about which door is which at the Sparky Twins' house. Sparky One decides to put a shiny shape on hers and goes to Stretchy's yard to get what she needs to make it. On the way, she finds an exciting echo tunnel and forgets what she was meant to be doing. She's surprised, when she gets home at last, to discover a shiny shape on both doors!