The competition looked identical. So how did Lego pull it off?

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More info and sources at bottom.

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Where I get my music (Free trial affiliate link):
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My camera, as of February 2022 (affiliate link):
https://amzn.to/3HDcWVz
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Try 3d printing a model!
https://cults3d.com/en/3d-model/game/...

He mentions that the replica isn't exact — that's why I shied away from really strong specific claims on my model's performance vs. LEGO. But I think you can totally see the difference and get a feel for Kiddicraft bricks.

My favorite book by Sarah Herman. It gets into a bunch of modern LEGO stuff I didn't read, but the early chronology was helpful. (affiliate link)
https://amzn.to/3RiFbPM

Overview of LEGO patent scandals and stuff like that. I didn't get into the Kiddicraft lawsuit — seemed like a bit of a nothingburger to me, based on the size of the reward. But I'm not a lawyer, so read up for yourself if you disagree.
https://www.nytimes.com/2005/02/02/bu...

Brick by Brick - book covers the same ground, gets into business-book-land, but sometimes that's fine.
https://amzn.to/3Y2yu6r

There are obviously millions of LEGO websites filled with arcana, but this one on LEGO evolution was great:
https://www.inverso.pt/legos/Textos/b...

Definitive info on Kiddicraft: https://www.brightontoymuseum.co.uk/i...)