IVO is correct, you can tell the difference between 30fps and 60fps even on a normal TV. The article doesn't even go into fields (I only read the first page, and it is kind of half-assedly written). First of all the frames in theaters aren't updated "all at once". There is a rotating shutter inside the projector, so part of the frame is revealed first and it is also the part to disappear first. There is blackness after the frame while the shutter is "closed" and then that same frame is repeated again. The next time the shutter is closed, the projector advances by one frame and then that is shown twice before the next frame. Repeat again and again. Some theaters even have 3 bladed shutters for a "72Hz refresh rate", but that also lowers the brightness of the image and a stronger xenon bulb must be used. Also on DVD each frame is not "repeated twice". I'm sure you could do a basic search and find tons about 3:2 pulldown on video.