Some guy made a toy for kids who like playing in the "back". It became so popular and widely played that when he realized the flaws in the first version of his toy, he moved on to make another toy instead. This one is more secured so kids don't get hurt while playing. It uses the same mechanism used in toys for kids who like playing in the "front" yard, to connect toys together. It comes with other cool features and now kids who have the first version are questioning themselves should they move on too.
Now, this is someone explaining it like he's doing so to a 5 year old.
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