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The bracket syntagma is an autonomous sequence where the elements contained within the segment do not in any way represent temporal narrative continuity - this is why they are an achronological syntagma.
In this sequence the series of images are generally understood to be related by a similarity or contiguity that is established, as we have seen, by their placement in a series. For instance a series of shots of a city may be to establish a sense of the city, or a series of shots of smiling children may be to create an idea of joy, or youth. The shots themselves, taken individually, are not presumed to relate to each other in any intrinsic manner (the buildings can all be unrelated and may have nothing to do with the narrative - we may never see them again), so they produce some common theme by virtue of their placement together.
This is unlike the parallel syntagma, where a similar series of apparently unrelated images are intercut with a second series to generate a contrast of some nature between the two series.
Such an effect is may be present in Deena Larsen's Ferris Wheels, though this work assumes some contiguity between nodes.
Adrian Miles: Hypertext syntagmas: cinematic narration with links
A performative hypertext presented by Journal of Digital Information