The next time I teach Photoshop class, I'm somehow going to work this Calvin & Hobbes comic into the explanation of how to add color to a black & white photo.

I remember thinking the exact same thing when I was a little kid. My childlike logic deduced that black and white photos were really old, therefore I should ask the oldest person I could find about them. I went to my grandma and asked her what it was like living in black and white times. I got a very grandma-ish answer about how it wasn't really black and white back then.

Now, my adult logic dictates that since photos & TV both started off as black & white and eventually became color, holograms must also start off as black & white. I suppose that science fiction works aren't too far off the mark when they have a mono-chromatic hologram, like Cortana in Halo.