Rensink et al. (1997), among others, have argued that visual representations formed when viewing a scene depend on our limited attentional focus and, for that reason, are necessarily:

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Rensink et al. (1997) argue that due to our limited attentional focus, the visual representations we form when viewing a scene are sparse. This means that at any given moment, we are only aware of a small portion of the visual scene, focusing on what our attention is directed towards, while much of the scene is not represented in detail in our minds.

Rensink Et Al