Drawing a globe in pixel art
I have been working on a side project which someday I'll publish. I wanted to
draw a hyperlink icon. I decided the best thing to do is draw a globe, and a
little chain link in front of it, all within a 24x24 canvas. I have drawn some
circles by hand, but larger diameters get tricky. I eventually just searched
it, and found a great little webapp: https://pcg.cytodev.io/. I plugged in
my radius of 12, and it generated just slightly too big a curve to fit
correctly in the 24x24 space. So a radius of 11 worked great! 
Using gimp, it is easy to copy this, flip it as needed, and make a complete
circle. 
And then to make it look like a globe, I added some lines to resemble latitude
and longitude, this time against a background instead of the transparency.
And the final asset has a little chain in front of the globe: 
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