(Pi, originally uploaded by [P!]Wack.)
This graphical representation of pi sure looks like an autostereogram to me.
If you click through and look at the large version, and then sort of relax your eyes, you can faintly start to hear a soft chanting of “Y’Ai’Ng’Ngah Yog-Sothot H’Ee-L’Geb F’Ai Trhodog Uaaaah“.
If at that point an image of a veil parting starts to appear, BLINK AND LOOK AWAY.
