"Emojidome", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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Thank you to the xkcd April 1st volunteers/commentators, including @Chromakode (Private), Kevin, @Aiiane (Private), Patrick, Kat, Reuven, @cotrone (Private), @bstaffin (Private), @zigdon (Private), schwal, Stereo, and everyone who voted!