>> Unfortunately, I don't know of any system which actually does this. So 
>> turning up the resolution just makes everything smaller and harder to 
>> see...
> 
> Ermm Windows does (you can tell it your monitor DPI in display settings 
> somewhere)

Really? That's interesting...

> I used this setting for ages on my laptop, but then I got a 
> new CAD program and it didn't like the higher DPI settings so I had to 
> go back to the defaults.

Hahaha... The irony! The one program you'd expect to make use of such 
information.

>>> IIRC
>>> your eye can resolve down to about 1/60 of a degree, so you can do 
>>> the maths...
>>
>> Apparently 1/60 degree is 1 minute of arc, the sine of which is about 
>> 0.0002909. So at 40cm distance, that's... 116.4 um, which is obviously 
>> nonesense.
> 
> How come? 116um sounds the right order of magnitude for a pixel pitch to 
> me.

Isn't 116um less than the wavelength of visible light?

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