I thought it nice that this was mentioned. The article and the video might not have had the detail you required, but the thats what the google search is for. I've seen holographic images before, and was very interested in how it's accomplished, but it was years ago and I didn't have the resources to look into it further. Sometimes its nice to be reminded of this kind of stuff. For myself, it's led to a night of googling and interesting reading. If its not enough for you, move on to the next article.