h a l f b a k e r y
Expensive, difficult, slightly dangerous, not particularly effective... I'm on a roll.
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I noticed the other day at a happy hour where i was not having
much fun, that if you smear finger oil around an iPhone screen
a white background, you can subtly manipulate how much the red
green and blue pixels are magnified. I propose that something
hardening vegetable oil could
be used (by someone who is a better
artist than me) to paint subtle portraits using this method.