What technique did he use?

From my most recent post I have been trying to find out how Shane Carmicheal accomplished the design of the of the first set of images shown in my last post. I have seen the technique used quite recently in a magazine called Computer Arts Projects, where the artist (which I have to get the name of and will post) used a technique of offsetting (by 0.5 -1 mm) the two layers of typography and lowering the opacity of the underlying layer thus creating this wonderful effect.