Yea I Was Thinking That Too - Tumblr Posts

I shall now throw my own hat into the Bill Cipher theory ring. I think that the reason Bill can see into the third dimension is his eye. It’s said several times that Euclidia is 2d and is thus perfectly flat. It’s safe to assume that the citizens are perfectly flat as well. Then we see Bill’s mugshot and the answer to “why can Bill see the third dimension” is basically given to us. I’m using the colorized version from the website for clarity.

His body is more or less two dimensional, I’m guessing the side edge is just for pose clarity, but his eye is clearly 3d. It sticks out from the rest of his body, like it’s not supposed to be there, like it’s a mutation. They even remark on his “strange eye” in the lullaby and Bill specifically goes to an eye doctor as a child. I think Bill Cipher can see into the third dimension because his eye is three dimensional.