A controversial concept as art by it's very nature is non-functional.
Louis Comfort Tiffany may have come closest with his priceless breathtakingly beautiful lamps but there was a necessary trade off between art and function, a hallmark of the period Art Nouveau, and other periods that have tried to mix the two together.
In 1985 I introduced Functional Energy Art, where there is no trade-off in a systematic attempt to replace lighting design with art in just about every conceivable application where good interior design is required.
In an accredited continuing education seminar approved by The American Society of Interior Designers I began the indoctrination of interior and lighting designers, architects, space planners, illumination engineers and museum curators into this new movement.
The course was short lived as I had to close my gallery/exhibition space due to a zoning regulation.