> As an analogy, you may ask "is harmony important in music?"
Odd thing to throw in there. No, it's not, whether you're talking about music consisting of a single line, or some variety of dissonant music which has no tonal centre and where it makes very little sense to talk about harmony other than in the very basic "more than one tone at once" sense which is utterly meaningless if you ask me.
Elephant/flea: well, you're making art for humans. Again, with the musical analogy there's stuff like John Cage's piece which is designed to last years, and at the other extreme people like Stockhausen have constructed pieces where a fragment of music is speeded up so that it's perceived as a "texture" to be used as a compositional building block rather than a series of pitches to be listened to in its own right.
Yes, I did add "in art" to avoid potential sniggering. Was your question in fact a way of highlighting that art should not be considered separately to anything else; that I might be suggesting that size might matter anywhere else except in the construction of artwork? I have a pretty open mind for what constitutes art. Duchamp said that anything could be art, and Zappa said that art was "making something out of nothing, and selling it"; he also wisely said that art should entertain you; don't worry about whether something is high art or low art.
Putting all that together, whilst I appreciate anyone doing art for the sake of it, with no rules about what or why or what size etc, when it comes down to it something that fits on a table is no more impressive to me whether it fulls a building or fits on the head of a needle.