Board Thread:Naruto Discussions/@comment-945885-20140709082448/@comment-24519434-20140720080225

Mrlmm0605 wrote:

3. Orochimaru delved deep into the worlds of chakra and science, amalgamating the two. He was able to convert himself, using this magiscience, into a snake being inhabiting a higher plane of existence, which required a human host (typically a corpse, after the effects of the jutsu take hold at least) to inhabit the base plane.

Law of conservation of matter, Orochimaru's new body rejects him so both bodies must be present. Yet Sasuke saw several people in Orochimaru's "dimension" if he had several bodies worth of matter he would be too dense to move.