Idea (情報体次元, lit. "Information Body Dimension"), originally a term in Ancient Greek philosophy, is, in regard to modern magic study, the platform on which Eidos are being recorded. The primary form of magic is the technique where one outputs the magic ritual on this so-called platform, Idea, and rewrite the Eidos recorded there.[1]
It is a giant Information Body on which all Information Bodies are stored, within seas of Pushions.