If a person's style includes fake gravel that is blue and green, that is there style. I have seen some very cool tanks that were made up nearly entirely of fake items, but had he cooles theme of being an entirely white tank; the fish, the decor, the substrate were all white. This effect is not possible with naural means, and it was just as much a work of art as most natural tanks I have seen.
I have seen plenty of 'natural' tanks which aren't works of art but were more or less paint-by-numbers type ADA clones, put together by formula, following guidelines which indicated various ADA products. I've also seen plenty of Walstad-style tanks which, while not really art, were thoughtful and attractive though the goal wasn't necessarily to have a composed, intentional aquascape within.
To me, tank which is inhumane to its fauna is an ugly thing. To others, who may not be concerned or aware of issues of fish 'happiness' and welfare, this is moot. An all-white tank may be nifty, may even be art, but all art isn't the same in the eyes of all beholders. My guess is that I wouldn't like the all white tank and would probably pan it. This is not to say it isn't art, just to say I doubt it would rate highly by my criteria.
My wish is not to draw a tight boundary between what is and what isn't art, but to discuss and articulate ideas about aesthetics, mindfulness, intention, and ethics as regards aquarium design, setup, and keeping.
Actually, I'd like to know more about the white aquarium: what sort of filtration, heating, decoration, lighting, fish, does the tank have a white back? Where in the room and what sort of room is it in? Maybe I don't think I'd like it but I'd love to know more about the choices the aquarist made and what the reasons for those choices were! Very interesting stuff, I daresay.