Sometimes when I watch an old movie for the first time, I enjoy looking up Ebert's review. I always appreciate his thoughts, and it's somehow comforting reading his words fresh after experiencing the movie.

"When you look at a 2-D movie, it's already in 3-D as far as your mind is concerned. When you see Lawrence of Arabia growing from a speck as he rides toward you across the desert, are you thinking, 'Look how slowly he grows against the horizon'? Our minds use the principle of perspective to provide the third dimension. Adding one artificially can make the illusion less convincing."