Richard wagner's concept of a totally unified artwork, which influenced twentieth century theories of "total theatre" and directing, is known as

In the mentioned question above, the answer is Gesamtkunstwerk. This is artwork that that has influenced the 20th century.  This artwork is not only known for its theories but it is also known for its importance in circumstances that are also used by architects. This type of art is not only used by architects but it is also used in the area of media and filming.

Gesamtkunstwerk (total work of art)

Explanation:

     When Whilhelm Richard Wagner, a 19th-century German composer, spoke of “total work of art” in his work titled “Das Kunstwerk der Zukunft” 1or “The Work of Art of the Future”, he proposed the convergence between artistic languages producing a spectacle. complete. For the composer, the arts should not be isolated from each other, since man is a being of language.

     His "total work of art" was considered a global theory for all arts, going against the limits imposed by art until the nineteenth century, which considered only the artistic languages separately.

    Wagner believed that painting, music and poetry had already reached the end of their evolution, and that to innovate would have to combine languages into a "Gesamtkunstwerk". He then developed a pioneering project: he built a building designed specifically for his operas, creating a unified entity between the orchestra and the stage. Something unusual for the time, which soon became common to the cinema and, today with digital media, is constantly updated. He even seemed to be predicting the emergence of what we today call hybrids.

your word would be isle.

isle is an island or peninsula especially a small one.

if you add the letter "a" you get aisle, which is a passage between 2 rows of something like chairs, shelves, or something else.