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Pound Puppies Here Puppy Puppy production flowchart - The Here Puppy Puppy toy was designed to emerge from its doghouse for play and interaction. Afterwards, it would home in on the doghouse, enter it, turn around, and go to sleep.
This turned out to be enormously challenging, as there is a very complex set of functions and parameters that have to work perfectly together, or the dog will fail to return successfully. It's easy to describe, but very hard to do.
I think I now have a hint of what NASA goes through with their Mars rover designs.