Do you remember looking at those Magic Eye images? Getting a steroscopic image to go 3D is a similar technique, but you need to view them through a special optical viewer. Doesnt quite work with a camera!!
This is a Victorian stereoscopic image from the collection of Sir Brian May ( yes him from Queen!) looking down a viewing lens
Over at FivePlusTwo we're looking for a person to who would enjoy and take on the challenge of a weekly self-portrait. Come along and play, it's fun!