We already have a 3D medium, one which can be viewed without colored glasses or lasers. I have a couple of "toy" cameras which have multiple taking lenses, and the film is processed to produce a prism print (lenticular lens) with a 3D effect. The 3D effect is most pronounced when your subject is 6-10 feet away, with a foreground and a background. (Clik 3D)
I also have a kit which allows a person to create an 8x10 using just an inkjet printer. It includes five large lenticular lenses and the necessary software.
Otherwise we use the old 3D technologies, with seperate photographs and lenses (stereoscope) or else make two exposures on a single piece of paper and use colored glasses (anaglyph).
And as for 4D, I supposed that would be 3D movies.
So, what it all amounts to is that digital technology will enable us to use old technology with convenience.
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