>>> Why do bright
>>> lights have an "aura" around them? I mean, you can see a fairy lights from
>>> quite a distance, considering how tiny they are. If I try and draw them with
>>> POVRay they'll be smaller than a single pixel... but in the real world they
>>> have a kind of "glare" around them which takes up more space and makes it
>>> easier to see them from a distance (when they're lit!) Is there some
>>> physical explaination for this?
>>>
>>> Or do I just need to clean my glasses???

Another part of the explanation is the eyelashes of the observer.  They
catch and redistribute small sources of light a lot more than you might
imagine.  I've seen literature on night-time driving simulators which have
explored these problems.

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