Amusing Easter Egg

[Creating sound from a spectrogram] allows electronic music artists to "hide" images in their music. Examples include:

• Aphex Twin hid an image of himself in a spectrogram (using MetaSynth). The image can be found on Track 2 of the Windowlicker EP as a nine-second sweeping section right at the end. (It is recognizable in an MP3, but the compression changes the spectrogram and it is not as clear as from the CD.) Aphex Twin also hid the image of a spiral shape in his first track from the "Windowlicker" EP.

Etc. Nine Inch Nails also uses this technique to give out clues to its alernate reality game (?!). See WP for more.

If I were BLDGBLOG I'd go off on a whole riff about this. Alas.