@Mathnerd314 Oh, good point

On May 16, 2014 2:38:57 PM EDT, Mathnerd314 <notifications@github.com> wrote:
>>  e :: Angle -> R2
>> -e = fromDirection
>> +e = fromDirection . (xDir .+^)
>
>Why not use ``rotate theta unitX``? That seems simple to write and
>clearer than lenses or the shorthand e.
>
>---
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