" The author is saying that actor lives in a closed world (metaphorically described as an "aquarium"). He further describes the aquarium as having a narrower aperture (even more insular viewpoint of life) than the (typically wide) lens aperture that is used in actual aquarium photography.
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Anonymoushe [actor] lives in a kind of aquarium,People don't live in aquariums. This is a metaphor implying that the actor has an insular lifestyle.
Anonymousone which is simply a little less generous with its ‘apertures’ than real aquariums.The aperture of the actor's