Wikipedia: Persistence of vision

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Through experience in the early days of film innovation, it was determined that any rate less than 16 frames per second caused the mind to see flashing images. Today's theatrical film--when the "film" is in fact film, that is "celluloid?"--runs at 24 frames a second. Digital Video, or DV, runs at 30 frames per second; television in the USA runs barely under 30 frames a second and at a comparable rate in other countries.

(following paragraph rely belongs in an article on celluloid film or somesuch)

Examples of film stocks include 35mm, the most common, as well as 70mm, 16mm, and 8mm. 8mm is common for home use, but grainy; 70mm is rare because of its cost, but allows a much finer picture (as can be seen in theatrical showings of [Lawrence of Arabia]?--viewers will not notice much difference at home, on TV). Examples of the difference in film quality are obvious in The Blair Witch Project--listen for Heather's comments about wanting to get footage on certain cameras.

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Also the name of a short story by JohnVarley?, and the title of one of his later [anthologies].

Also the name of a short story by [John Varley]?, and the title of one of his later [anthologies].

The theory that the mind retains an image for a split second. This accounts for the fact that when a motion picture flashes a series of progressive images, instead of the mind seeing the flashing of a series of images, it sees the illusion of motion.

Also the name of a short story by [John Varley]?, and the title of one of his later [anthologies].