While it's never properly graced the Mario games again outside of Super Mario Bros. 2 and its ports, remakes, and the like, it does serve as perhaps one of, if not the earliest of examples of Nintendo's recurring use of mirror dimensions in their games, including The Legend of Zelda: A Link to the Past and Metroid Prime 2: Echoes. (poisonmushroom.org)
Mannov's 5 - piece installation juxtaposed actual abstract paintings with concrete - and - plaster reliefs, adjacent to a projection of a transparency showing computer - generated molten - metal squirts masked into a «painting» of mirrored dimensions. (woahis.us)
It also helps to know a little about the mirror dimension and the astral plane. (businessinsider.com)