Art's observations and speculations about William are partly correct, including the "inner subspace" that was flipped; there truly exists a subspace area within the abyssal body, which William has stabilized and projected his [Thought Hall] into.
Through the creation of a region suitable for internal activity and communication using a large amount of abyss black worms as "space cement",
there's also a most crucial function, which is the internal analysis and processing of materials difficult to flip, thus this stabilized inner subspace is also called the "flip room".
Created based on the structure of the Thought Hall, the interior mostly resembles a library.
William, flipped inside, is sitting at the desk in the center of the library, flipping the 'Storybook' that serves as a malignant energy vessel,
the whole library is already filled with malignant aura, with projections of numerous 'Evil Maiden-Human Body Collector' scattered throughout various areas,
