>>> Arbitrarily rotated windows implies you
>>> need a very high pixel density to avoid visible aliasing.
>>
>> It's called "vector graphics". ;-)
>
> In fact, displays that actually work with vector graphics (see
> http://en.wikipedia.org/wiki/Vector_display) instead of pixels indeed
> existed at some point: Instead of scanning line by line with a cathode
> ray you can also scan arbitrary lines.

The "some point" would be "the point when buying enough RAM to hold an 
entire framebuffer was prohibitively expensive".

While vector graphics has the advantage of smoothness, it has several 
unfortunate downsides:

- You can't turn a real-world image such as a photograph into vector 
graphics.

- Some effects such as blurring are trivial with raster graphics, but 
impossible with vector graphics.

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