Did you know that you can make your own holograms? Matt Richardson shows you how to do just that with the Litiholo Kit, available in the Maker Shed:
http://www.makershed.com/DIY_Hologram_Kit_p/mklh1.htm&Click=37845

For more information about the science behind holography, check out:
http://science.howstuffworks.com/hologram.htm