The signature pavilion that drew some of the biggest crowds at the Osaka-Kansai Expo is getting a second life. Media artist Yoichi Ochiai's "null²" — the mirror-clad structure nicknamed "nuru nuru" — is reborn as "null²ⁿ" (null-null nexus), a permanent museum theater opening on 14 October inside Yokohama Landmark Tower. The new venue inherits the pavilion's worldview: a space where the boundaries between the physical and the digital dissolve through interactive media, reflective surfaces, and responsive sound and light. Where the Expo version was a temporary spectacle visited by millions, the Yokohama incarnation is designed as a standing institution, inviting repeat encounters with an environment that shifts around its visitors. Roughly a year after the Expo, the question is how the concept has evolved. A pre-opening report from Bijutsu Techo tours the interior to see what has changed in the translation from world's-fair pavilion to a permanent urban venue — from crowd-scale choreography to a more intimate, theatrical setting. The opening marks a rare move in Japan's media-art landscape: an Expo pavilion, normally dismantled after the fair, converted into a lasting cultural facility. For Ochiai, one of the country's most visible artist-researchers, it extends an ongoing experiment in what a museum can be when the architecture itself behaves like a living medium.