Iconography of the PuTTY tools(chiark.greenend.org.uk)
367 points by Tomte | 95 comments
Simon Tatham's blog post on the history and evolution of the PuTTY tools' icons, from hand-drawn designs through scripted rendering to an SVG revamp.
#simon-tatham on Hacker News
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XOR(chiark.greenend.org.uk)
541 points by mariuz | 91 comments
Simon Tatham's long-form essay explaining the XOR operation in boolean logic and on integers, its properties, and applications such as cryptography, graphics, and swaps.