The word "time" is central to [critic ]Mr. Lerdahl's argument, for it explains why an equally complicated painting like Pollock's "Autumn Rhythm" appeals to viewers who find the music of Mr. Boulez or the prose of Joyce hopelessly offputting. Unlike "Finnegans Wake," which consists of 628 closely packed pages that take weeks to read, the splattery tangles and swirls of "Autumn Rhythm" (which hangs in New York's Metropolitan Museum of Art) can be experienced in a single glance. Is that enough time to see everything Pollock put into "Autumn Rhythm"? No, but it's long enough for the painting to make a strong and meaningful impression on the viewer.
In a word, the constraints of sensory memory, determined by the sensory modality which is being used (hearing, vision, language, etc.)