It relies on a property of the Unicode character-encoding scheme, which has a vast array of letters and glyphs from non-Roman alphabets. Think of it as ASCII on steroids.

Unicode has enough characters that many standard Roman alphabet characters have upside-down equivalents. When you type letters into the upper box, they appear upside down in the lower box via Unicode translation, according to the site’s designer, David Faden. Very clever, though Firefox’s spell-check wasn’t fooled, and capital letters and numbers don’t work.

“˙ɥƃnoɥʇ ‘ǝɹǝɥʇ pǝıɹnq ǝɹɐ sǝɹnsɐǝɹʇ ʇɐɥʍ ǝǝs oʇ sʇɹɐɥɔ ǝpoɔıun ǝɥʇ ɥƃnoɹɥʇ ƃıp oʇ unɟ sı ʇı” ˙pıɐs uǝpɐɟ “‘ʎɥdɐɹƃodʎʇ uı ʇsǝɹǝʇuı ɹɐlnɔıʇɹɐd ʎuɐ ɯıɐlɔ ʇ,uɐɔ ı”


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