To turn on the special version of Medium, go to the homepage or search page, search for C:\WINDOWS (all uppercase!), and press Enter
System shock
Marcin Wichary

Just confuse, amaze, and curious for a while. “How the heck he did this?” 
Type “ C:\WINDOWS” and the font changed. 
And so I realized later, He is the designer of medium. LOL

Very fun easter egg.

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