I think that's definitely true, at least in static designs (like a garden layout). Not sure if it applies as strongly in a fish tank where the things you're trying to subconsciously count are moving around anyways. Even in a small tank - I have an even number of fish in my 24g cube but you pretty much never see them all at the same time.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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