User blog comment:GoDai/GoDai's Translations: T.U.S., Exis, and Phantaminum (Pentaminum)/@comment-24434281-20120621041050/@comment-1926430-20120621044615

Yeah I'm thinking it's either

1) one of those Harry Potter tent things, like a huge American continent-sized area is compressed in, as you said.

2) the Tower floors are like separate dimensions, like how 20F seems to be floating in the air (well, shinsoo) or something.