>>Well, I thought maybe it would be clearer if it rotates (in 3D).
> 
> 
> So it rotates in the x-y-plane (I guess a rotation can't by defined 
> by an axis in 4D).

Yup. In 3D, a normal vector defines a plane - but in 4D it defines a 3D 
volume. So yes, you have to define it by plane rather than axis.

> I wonder what it would look like it it did 
> rotate in the x-w-plane...

Just for you... see my next post. (I wasn't gonna post this one cos it's 
not as interesting to look at, but since you asked nicely...)

Andrew @ home.

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