(DIR) xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
 (DIR) Floodgap Gopher Fun and Games
        
       xkcd - A Webcomic - Interaction (1961)
        
       Image:
 (PNG) interaction.png
        
       [They do not move.]
        
       Comics reproduced from www.xkcd.com under license.
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