Cube House

Cube House is a Stand featured in the novel JORGE JOESTAR, and its owner, Penelope de la Rosa, wields it without ever realizing it. From outside it is a windowless white cube with no visible door or entrance of any kind, but its interior is shaped like a tesseract, a four-dimensional structure whose walls are covered in doors opening onto different rooms. In time it evolves into the Arrow Cross House, which acts as the physical body belonging to Reimi Sugimoto.

The building's inside is laid out as a four-dimensional tesseract of eight rooms fused along every face, and each interior door leads somewhere different from the last, defying ordinary physics. Joji Joestar records its bizarre governing rules: horizontal travel stays on the floor, doors set in the floor open onto the ceiling, and the side doors of Rohan's study open instead onto the corridors of the Arrow House rather than the adjoining rooms.

Because seven cubes combine to form an enclosing eighth, the House seals off a universe entirely its own, its walls forming that universe's outer edge, so any attack or damage from outside can never reach the interior. This is how Fukashigi and Rohan survive Kira's Killer Queen while placed beneath the Arrow Cross House, since the Cube House below held a zone where everything was reduced to zero. It is built to hold only a single occupant. Reimi warns that two or more people inside trigger contradictions, forcing the rooms to rotate for space, and to resolve them the House drags one person into a parallel universe and strands them there with no way out.

Penelope de la Rosa is the unwitting user of Cube House. After the structure appeared in Morioh around 2004, seemingly relocated from Nishi Akatsuki with no known owner, it evolves into the Arrow Cross House bound to Reimi Sugimoto.