An interactive introduction to rotors from geometric algebra (2018)

Related. Others?

Let's remove Quaternions from every 3D Engine (2018) - https://news.ycombinator.com/item?id=29512302 - Dec 2021 (38 comments)

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I'm pretty soft on this subject but one thing that's always bugged me when I see bivectors represented as a parallelograms is that different coplanar parallelograms of the same area are the same bivector algebraically but visually very different. It just feels confusing when you're trying to learn what it "is".